Top Happiest Baby Deals & Price Drops for April 2026

About SNOO Baby Bassinet Fitted Sheets Includes: (3) SNOO Baby Bassinet Fitted Sheets Fitted Sheets are made from premium soft and breathable 100% cotton Save 35% when you buy 3 sheets instead of 1 Six out-of-this-world color combinations to choose from SNOO Bassinet Sheets Color Combinations: Graphite Galaxy, Ivory Galaxy, Black Galaxy Graphite Galaxy, Ivory Galaxy, Midnight Galaxy Graphite Galaxy, Ivory Galaxy, Rose Galaxy Graphite Galaxy, Ivory Galaxy, Teal Galaxy Black Galaxy, Ivory Galaxy, Black Galaxy Ivory, Charcoal Galaxy, Ivory Galaxy Bassinet Sheets Description One of the most important lessons of parenthood is to always be prepared. That’s why stocking up on three fitted bassinet sheets is such a smart idea! (Not to mention, you’ll save $20.95!). We make our SNOO Baby Bassinet Sheets with soft, premium 100% organic cotton. We understand how important sleep is for your baby (and you!). That’s why, when it comes to our bassinet sheets, we’re committed to comfort and quality down to every last detail. Sweet dreams! Want a single sheet instead of a bundle? Click here to buy a single SNOO bassinet sheet. Note: SNOO Sacks and sheets sold separately. Click here for SNOO Sacks. 100% Organic Cotton Baby Bassinet Sheets for SNOO | Graphite/Ivory/Black

Description Being prepared is a parenting essential! We know accidents happen—especially in those early days—so don’t get caught without an extra SNOO sleep sack or SNOO bed sheet! The Big Baby Bundle includes three of Happiest Baby’s SNOO sacks in every size (Small, Medium, Large) plus, two additional fitted sheets—all made from 100% organic cotton! And, when you buy the Big Baby Bundle…you’re saving 35% off the original price. About Big Baby Bundle All items are made from 100% Organic Cotton. Available in: Ivory 3 Ivory SNOO sacks (S, M, L) 2 Ivory sheets Black & Ivory Planets 1 Ivory Planets SNOO Sack (S) 2 Ivory Planets with Black Wings SNOO Sacks (M and L) 1 Black Galaxy sheet, 1 Ivory Galaxy sheet Rose Planets 3 Rose Planets SNOO Sacks (S, M, L) 2 Rose Galaxy sheets Teal Planets 3 Teal Planets SNOO Sacks (S, M, L) 2 Teal Galaxy sheets Graphite Planets 3 Graphite Planets SNOO Sacks (S, M, L) 2 Graphite Galaxy sheets Charcoal Planets 3 Charcoal Planets SNOO Sacks (S, M, L) 2 Charcoal Galaxy sheets Midnight Planets 3 Midnight Planets SNOO Sacks (S, M, L) 2 Midnight Galaxy sheets Ivory Planets 3 Ivory Planets SNOO Sacks (S, M, L) 2 Ivory Galaxy sheets Charcoal Stars 3 Charcoal Stars SNOO Sacks (S, M, L) 2 Charcoal Galaxy sheets Graphite Stars 3 Graphite Stars SNOO Sacks (S, M, L) 2 Graphite Galaxy sheets Big Bundle Fabric & Care SNOO Sack: 95% Organic Cotton, 5% Elastane. Trim: 100% Polyester. SNOO Sheet: 100% Organic Cotton Machine wash sacks and sheets in cool or cold water with like colors. Never use hot water or chlorine bleach. Tumble dry on a low heat setting, making sure to dry the sack completely or air dry for best results! Please Note: Before putting SNOO Sack in the washer, always attach the arm bands & leg flap to each other and zip the sack completely closed. That will avoid damage that might be caused by the fastener clinging to other items in the load. The Big Bundle | Rose/Galaxy and Planets

About SNOO Baby Bassinet Fitted Sheets Includes: (3) SNOO Baby Bassinet Fitted Sheets Fitted Sheets are made from premium soft and breathable 100% cotton Save 35% when you buy 3 sheets instead of 1 Six out-of-this-world color combinations to choose from SNOO Bassinet Sheets Color Combinations: Graphite Galaxy, Ivory Galaxy, Black Galaxy Graphite Galaxy, Ivory Galaxy, Midnight Galaxy Graphite Galaxy, Ivory Galaxy, Rose Galaxy Graphite Galaxy, Ivory Galaxy, Teal Galaxy Black Galaxy, Ivory Galaxy, Black Galaxy Ivory, Charcoal Galaxy, Ivory Galaxy Bassinet Sheets Description One of the most important lessons of parenthood is to always be prepared. That’s why stocking up on three fitted bassinet sheets is such a smart idea! (Not to mention, you’ll save $20.95!). We make our SNOO Baby Bassinet Sheets with soft, premium 100% organic cotton. We understand how important sleep is for your baby (and you!). That’s why, when it comes to our bassinet sheets, we’re committed to comfort and quality down to every last detail. Sweet dreams! Want a single sheet instead of a bundle? Click here to buy a single SNOO bassinet sheet. Note: SNOO Sacks and sheets sold separately. Click here for SNOO Sacks. 100% Organic Cotton Baby Bassinet Sheets for SNOO | Ivory/Charcoal Galaxy/Ivory Galaxy

Prepare for parenthood with confidence using The Big Bundle from Happiest Baby. This essential collection ensures you are never without a fresh SNOO sleep sack or fitted sheet, even during those unpredictable early days. The Ivory Big Bundle includes three premium SNOO sacks in every size—Small, Medium, and Large—along with two additional 100% organic cotton fitted sheets. This complete set offers incredible value, saving you 35% compared to purchasing each item separately. Crafted for your baby's comfort and safety, all items are made from soft, breathable 100% organic cotton. The SNOO sacks feature a blend of 95% organic cotton and 5% elastane for a gentle, secure fit, with a polyester trim. Each piece is designed to work seamlessly with your SNOO smart sleeper. Care is simple. Machine wash sacks and sheets in cool water with similar colors, avoiding hot water and bleach. Tumble dry on low heat or air dry for best results. Always remember to attach the arm bands and leg flap together and zip the sack closed before washing to protect the fasteners. Visit HappiestBaby.com to secure your Big Bundle in the serene Ivory color. This practical bundle is the smart choice for new parents, providing peace of mind and significant savings on the highest quality sleep essentials for your little one.

Discover the ultimate convenience and comfort for your newborn with the Sleepea Swaddle Sack 3 Pack Bundle from Happiest Baby. This curated Newborn Bundle includes two size small and one size medium swaddle sacks, providing the perfect supply for those precious early months. Made from ultra-soft, 100% organic cotton, these doctor-designed sacks keep your baby cozy while promoting safe, healthy sleep. Our award-winning 5-second swaddle design makes bedtime effortless. The unique double zipper allows for easy diaper changes from the top or bottom, while special inner arm bands and a leg flap ensure even the most determined little escape artists stay snugly wrapped all night. Breathable mesh at the shoulders and waist helps regulate temperature, preventing overheating for a more restful sleep. You’ll appreciate the extra-quiet adjustable fastener that won’t startle your light sleeper during nighttime changes. The Sleepea swaddle is also hip-healthy, carrying the International Hip Dysplasia Institute seal of approval. As your baby grows, the arm openings can be unsnapped for a natural transition to independent sleep with arms out. By choosing this bundle at HappiestBaby.com, you save 30% compared to buying a single swaddle. Having multiple sacks on hand is a lifesaver for quick changes after inevitable spit-ups or leaks, ensuring you and your baby are always ready for a peaceful night. Trusted by parents and celebrated by experts, the Sleepea Swaddle Sack Bundle is the last swaddle you’ll ever need to buy.

Prepare for parenting with confidence using the Happiest Baby Big Bundle in Midnight/Galaxy and Planets. This essential collection ensures you're never caught off guard by middle-of-the-night accidents or quick changes. The bundle includes three SNOO sleep sacks in every size—Small, Medium, and Large—along with two additional fitted sheets, all crafted from 100% organic cotton for your baby's delicate skin. Choosing the Midnight/Galaxy and Planets design means your nursery will feature a beautiful, soothing celestial theme. The set provides complete coverage for your baby's growth from newborn through the infant stages, eliminating the worry of running out of clean sleep essentials. Each piece is designed for the SNOO smart sleeper, promoting safer and longer sleep. By investing in this Big Bundle, you secure a significant 35% savings compared to purchasing each item separately. It’s a smart financial decision that delivers immediate value and long-term convenience. The organic cotton fabric is gentle, breathable, and perfect for a baby's sensitive skin, supporting peaceful rest night after night. Care is straightforward for busy parents. Simply machine wash the sacks and sheets in cool water and tumble dry on low. Remember to fasten the arm bands and zip the sack closed before washing to protect the fabric. Visit HappiestBaby.com to explore this and other thoughtfully designed bundles that make parenting a little easier and a lot happier.

Prepare for every parenting moment with the Happiest Baby Big Bundle in Teal Galaxy and Planets. This essential collection ensures you are never without a clean, comfortable SNOO sleep sack or fitted sheet, making those unexpected messes and late-night changes stress-free. The bundle includes three premium SNOO sleep sacks in every size: Small, Medium, and Large. You also receive two additional fitted sheets, all crafted from 100% gentle, organic cotton for your baby's sensitive skin. This complete set grows with your child through their first months in the SNOO. Choosing the Teal Galaxy and Planets design brings a touch of celestial charm to your nursery. The beautiful teal color with playful planet patterns creates a soothing and stylish sleep environment. By purchasing this Big Bundle from Happiest Baby, you unlock significant value. You save an impressive 35% compared to buying each item individually. It is the smart, economical choice for prepared parents. Every item is designed for convenience and durability. The SNOO sacks feature a blend of organic cotton and elastane for a gentle, secure fit. The matching sheets provide a perfectly snug fit on the SNOO mattress. Care is simple. Machine wash in cool water and tumble dry on low. Always remember to fasten the arm bands and zip the sack closed before washing to protect the fabric. Visit Happiest Baby at happiestbaby.com to explore this and other bundles. Invest in peace of mind and unparalleled savings with the Teal Galaxy and Planets Big Bundle, your all-in-one solution for serene and stylish sleep.

Ensure your baby's comfort and your peace of mind with the Happiest Baby SNOO Bassinet Sheet Bundle. This essential set includes three premium fitted sheets, crafted from luxuriously soft and breathable 100% organic cotton. Designed specifically for the SNOO smart sleeper, these sheets provide the perfect foundation for safe, restful sleep. Choosing our bundle is a smart and economical choice for new parents. By purchasing this set of three sheets, you save over 35% compared to buying them individually. This practical investment means you’ll always have a fresh, clean sheet ready, making nighttime changes quick and effortless. Available in sophisticated color combinations like Graphite, Ivory, and Midnight, these sheets complement your nursery decor while offering exceptional quality. The fitted design ensures a secure, wrinkle-free fit on your SNOO mattress, promoting a safe sleep environment. At Happiest Baby, we prioritize your baby's comfort and your family's well-being. Our organic cotton sheets are gentle on delicate skin and designed for durability through countless washes. Visit HappiestBaby.com today to stock up on these essential sheets and enjoy more serene nights, knowing your little one is resting on the best.

Discover the ultimate solution for peaceful nights with the Sleepea Comforter Swaddle in Large size, featuring the charming Ivory Cherries print. Designed by Happiest Baby and the renowned pediatrician Dr. Harvey Karp, this swaddle combines safety, simplicity, and comfort for babies weighing 18 to 25 pounds. Our award-winning 5-Second Swaddle design eliminates the frustration of traditional wrapping. Made from 100% organic cotton, it provides a secure and gentle hug that soothes your baby's startle reflex, promoting longer and more restful sleep. The integrated comforter layer adds just the right amount of extra warmth, ensuring your little one stays cozy without overheating. This thoughtful design means you can trust that every detail prioritizes your baby's safety and your own peace of mind. Parents love the consistent, perfect wrap it delivers every single time. No more loose blankets or complicated folds. Simply secure the swaddle in seconds and watch your baby drift into a serene slumber. Visit HappiestBaby.com to explore our complete collection of sleep solutions crafted by experts. Give your baby the gift of secure comfort and give yourself the gift of confidence and rest. Choose the Sleepea Comforter Swaddle for a happier, more rested family.

Wrap your little one in the perfect blend of security and comfort with the Sleepea Comforter Swaddle from Happiest Baby. Designed by renowned pediatrician Dr. Harvey Karp, this innovative swaddle combines our celebrated 5-Second Swaddle technique with a cozy, integrated comforter layer. The result is a safe, snug, and warm environment that helps soothe babies and promote longer, more restful sleep. Crafted from 100% certified organic cotton, the Sleepea Comforter Swaddle is gentle on delicate skin and provides breathable warmth for your baby. The medium size is ideal for infants weighing 12 to 18 pounds, offering a perfect fit as they grow. The charming Ivory Cherries pattern adds a sweet and timeless touch to your nursery essentials. Parents love the foolproof design that eliminates the frustration of traditional blanket swaddling. The secure wrap ensures your baby stays safely bundled all night long, giving you peace of mind and more precious sleep for everyone. It’s the thoughtful detail you need for those early months, merging pediatric expertise with practical parent-friendly design. Discover why this award-winning swaddle is a favorite among new families. Visit Happiest Baby at https://www.happiestbaby.com to explore our collection of sleep solutions designed to support your baby’s development and your family’s well-being. Embrace easier nights and happier days with the trusted Sleepea Comforter Swaddle.

Discover the ultimate sleep solution for your growing baby with the Happiest Baby 100% Organic SNOO Sleep Sack in X-Large. Expertly crafted by renowned pediatrician Dr. Harvey Karp, this sleep sack is the perfect companion for the SNOO Smart Sleeper, designed to promote safer, longer, and happier sleep for your little one. Every detail prioritizes infant safety and provides invaluable peace of mind for parents. Made from 100% certified organic cotton, this Graphite Planets patterned sack offers gentle, breathable comfort for babies weighing 23 to 25 pounds. The specialized design integrates seamlessly with the SNOO's responsive rocking and soothing sounds, helping to calm fussiness and encourage restful sleep. It’s more than just a wearable blanket; it’s an essential component of a scientifically-backed sleep system. Visit HappiestBaby.com to explore our complete collection of sleep solutions designed with your family’s well-being in mind. Invest in a product that supports your baby’s development and gives you the confidence of a safer sleep environment. Choose the SNOO Sleep Sack for a smarter, happier start to every night.

Discover the Sleepea 5-Second Baby Swaddle in Ivory Lemons, designed for newborns 5 to 12 pounds. This small size swaddle simplifies one of parenting's first challenges, offering a secure and comforting wrap in mere moments. Created by the renowned pediatrician Dr. Harvey Karp, every detail prioritizes your baby's safety and your peace of mind. Made from 100% premium organic cotton, it is gentle on delicate skin and promotes restful sleep. The intuitive design eliminates the frustration of traditional blankets, ensuring a snug fit every single time you use it. This award-winning swaddle helps soothe startle reflexes, allowing your little one to sleep more soundly and for longer stretches. Parents trust HappiestBaby.com for expertly designed solutions that support infant development and family well-being. The Sleepea swaddle is more than just a product; it's a tool for happier, healthier beginnings. Experience the difference that thoughtful, pediatrician-backed innovation can make during those precious early months. Choose the Sleepea swaddle for effortless comfort and proven security. Visit Happiest Baby to bring this essential item home and transform your baby's sleep routine with confidence and ease.

Give your little one the gift of safe, sound sleep with the Happiest Baby 100% Organic SNOO Sleep Sack in Ivory Watermelons. Designed exclusively for use with the revolutionary SNOO Smart Sleeper, this X-Large size sack is the perfect solution for babies weighing 23 to 25 pounds. Created by the renowned pediatrician Dr. Harvey Karp, every detail prioritizes infant safety and provides parents with invaluable peace of mind. This isn't just any sleep sack; it's an integral part of a system proven to help babies sleep longer and more peacefully. The secure, swaddling design works in harmony with the SNOO's gentle rocking and soothing white noise, mimicking the comforting sensations of the womb. The result is a happier, more rested baby and more predictable rest for the whole family. Crafted from 100% certified organic cotton, the fabric is incredibly soft against your baby's delicate skin and allows for healthy airflow. The charming Ivory Watermelons print adds a sweet, cheerful touch to your nursery decor. The innovative design includes secure shoulder wings and a middle band that safely keeps your baby on their back, aligning with the safest sleep practices. Visit HappiestBaby.com to complete your SNOO experience with this essential, doctor-designed sleep sack. It's more than bedding; it's a trusted tool for safer sleep and saner nights, helping you and your baby get the rest you need to thrive. Discover the difference that thoughtful, evidence-based design can make for your family's sleep journey.

Give your little one the gift of safer, longer, and happier sleep with the Happiest Baby 100% Organic SNOO Sleep Sack in Large. Expertly crafted by renowned pediatrician Dr. Harvey Karp, this essential sleep sack is the perfect companion for the SNOO Smart Sleeper, designed with meticulous attention to both infant safety and parental peace of mind. Our Butter Yellow Cherries print brings a soft, cheerful touch to your nursery. Made from 100% certified organic cotton, it offers gentle, breathable comfort for your growing baby, sized perfectly for little ones between 18 and 25 pounds. The SNOO Sack’s unique design integrates seamlessly with the SNOO’s responsive rocking and soothing, helping to promote longer, more restful sleep cycles. Every feature, from the secure swaddle wings to the safe zipper closure, is engineered to keep your baby snug and secure all night long. Trust in the expertise behind Happiest Baby to support your family’s sleep journey. Visit us at https://www.happiestbaby.com to discover how this organic sleep sack can become a cornerstone of your baby’s healthy sleep routine, giving you more moments of joy and rest.

Ensure your baby's comfort and your peace of mind with Happiest Baby's premium 100% Organic Cotton Bassinet Sheets, designed exclusively for the SNOO smart sleeper. This essential three-pack bundle offers incredible value, allowing you to save significantly compared to purchasing sheets individually. Always be prepared for any midnight mess while keeping your nursery beautifully coordinated. Crafted from luxuriously soft and breathable certified organic cotton, these fitted sheets provide a safe, gentle, and hypoallergenic sleep surface for your newborn's delicate skin. We prioritize your baby's comfort because we know quality sleep is fundamental for their development and your rest. The precise, secure fit is engineered specifically for the SNOO bassinet mattress, ensuring a smooth, wrinkle-free layer that stays perfectly in place all night long. Choose from stylish, modern color combinations like the sophisticated Graphite, Ivory, and Rose set to complement your nursery decor. Having multiple sheets on hand means you can quickly change the bedding without a late-night laundry scramble, making those inevitable spills and spit-ups much less stressful. Discover the perfect blend of practicality, premium quality, and value at HappiestBaby.com. Invest in the details that matter for sweeter dreams for your entire family.

Discover the ultimate swaddling solution with the Sleepea 5-Second Baby Swaddle in Charcoal Stars from Happiest Baby. Designed by renowned pediatrician Dr. Harvey Karp, this medium size swaddle is expertly crafted for babies 12 to 18 pounds, ensuring a perfect fit every time. Our award-winning design eliminates the guesswork, allowing you to achieve a secure and cozy wrap in just five seconds. This means less fuss for your baby and more peace of mind for you during those precious sleep times. Made from 100% certified organic cotton, the Sleepea swaddle is gentle on your baby's delicate skin while providing breathable comfort. The unique Charcoal Stars pattern adds a touch of modern style to your nursery essentials. Each detail, from the secure fasteners to the roomy hip pocket, is engineered with infant safety and parent convenience as the top priority. You can trust that your little one is sleeping safely and soundly. Parents everywhere rely on Happiest Baby for products that support healthy sleep habits. The Sleepea swaddle helps soothe the startle reflex, promoting longer and more restful sleep for your baby. Visit HappiestBaby.com today to explore our full collection of sleep solutions and bring home the swaddle that makes bedtime blissfully simple. Experience the difference that thoughtful, pediatrician-designed innovation can make for your family.

Help your baby drift off to dreamland with the Happiest Baby Sky Mobile. Designed by renowned pediatrician Dr. Harvey Karp, this enchanting mobile features nine soft woolen clouds that dance gently above your little one. The secret is on the underside: each cloud has a special high-contrast pattern specifically created to capture and hold your newborn’s developing gaze, encouraging calm focus and longer, sweeter sleep sessions in their SNOO smart sleeper. The Sky Mobile attaches securely to your SNOO, providing a captivating sky of floating clouds for your baby’s first five months. It’s thoughtfully designed to swing easily out of the way when you need to place your baby in or lift them out, making your routine effortless. When your child graduates from the SNOO, this mobile transforms into a beautiful piece of timeless nursery decor. Simply detach it from its mount and hang it from the ceiling to enjoy its serene beauty for years to come. Crafted with a soft wool exterior and a cozy polyfill interior, it’s as soothing to touch as it is to watch. Visit HappiestBaby.com to bring this magical combination of sleep science and beautiful design into your nursery. It’s more than a mobile; it’s a tool for peaceful sleep and a keepsake you’ll both cherish.

Discover the ultimate soothing companion for your little one with the SNOObear 3-in-1 White Noise Lovey in Cocoa Woolly from Happiest Baby. This versatile cuddly bear combines a portable white noise machine, a soft lovey, and an engaging puppet into one indispensable tool for parents. Whether you're managing a late-night feeding, navigating a car ride, or visiting family, SNOObear is your reliable partner for calming fussiness and encouraging peaceful sleep. It features the same unique, effective white noise sounds found in the award-winning SNOO bassinet, trusted by families worldwide. What sets SNOObear apart is its intelligent responsiveness. After the initial soothing sound cycle ends, it quietly monitors your baby and will automatically restart the calming white noise if it detects crying, offering continuous comfort without you needing to lift a finger. The plush Cocoa Woolly design is irresistibly soft, making it a perfect cuddly friend for babies and toddlers. More than just a toy, it’s a proactive sleep aid designed to help ease transitions and soothe your child back to sleep during inevitable wake-ups. Visit HappiestBaby.com to bring home this innovative helper. Simplify your parenting journey with a lovey that actively supports your baby’s sleep, anywhere and anytime.

Wrap your little one in comfort and security with the Sleepea 5-Second Baby Swaddle in Ivory Lemons from Happiest Baby. Designed for babies up to 25 pounds, this X-Large size ensures your growing baby enjoys the soothing benefits of swaddling longer. Created by renowned pediatrician Dr. Harvey Karp, this swaddle takes the frustration out of bedtime with its ingenious 5-second design for a perfect, secure wrap every single time. Crafted from 100% certified organic cotton, it’s gentle on delicate skin and provides breathable comfort. The clever design helps calm the startle reflex, promoting longer, more restful sleep for your baby—and more peace of mind for you. Parents love the ease of use, especially during those late-night changes, making it a sanity-saving essential. As an award-winning favorite, the Sleepea swaddle combines safety, simplicity, and superior quality. Discover this parent-approved solution and explore more genius baby products designed for happier sleep at HappiestBaby.com. Give your baby the gift of secure, serene sleep with this trusted swaddle.

Discover the secret to soothing your newborn with the Happiest Baby on the Block streaming video, available instantly from HappiestBaby.com. Created by renowned pediatrician and best-selling author Dr. Harvey Karp, this essential guide introduces you to the revolutionary 5 S’s method that has transformed infant care. Learn Dr. Karp’s proven calming techniques, including the art of the perfect swaddle, to help your baby feel safe, secure, and content. Parents everywhere call this video a lifesaver, providing immediate relief for fussy infants and more restful nights for the whole family. As one satisfied customer shared, the methods worked from the very first viewing, turning stressful moments into moments of peace. This isn’t just advice; it’s a practical, easy-to-follow system that delivers real results. Your purchase grants you instant access to stream this invaluable resource directly from the Happiest Baby website. It’s the perfect gift for expecting parents or a must-have for your own parenting toolkit. Join the thousands of families who have found confidence and calm through Dr. Karp’s teachings. Begin your journey to a happier, more peaceful baby today by streaming Happiest Baby on the Block.

Give your little one the gift of safe, sound sleep with the Happiest Baby 100% Organic SNOO Sleep Sack in Large. Designed exclusively for use with the revolutionary SNOO Smart Sleeper, this sleep sack is the key to longer, more peaceful nights for your baby and your entire family. Created under the guidance of renowned pediatrician Dr. Harvey Karp, every detail prioritizes infant safety and provides priceless peace of mind for parents. Crafted from premium 100% organic cotton, the Ivory Cherries design offers a soft, breathable, and gentle cocoon for babies weighing 18 to 25 pounds. The innovative secure swaddle design works in harmony with the SNOO's responsive rocking and soothing white noise, helping to calm startle reflexes and encourage deeper, safer sleep. This integrated system is clinically proven to add hours of sleep, supporting healthy development and giving weary parents much-needed rest. Choosing Happiest Baby means investing in sanity-saving solutions backed by expert pediatric science. The SNOO Sack is an essential component for getting the most out of your SNOO Smart Sleeper, ensuring your baby is secured safely for all naps and overnight sleep. Visit happiestbaby.com to complete your sleep setup with this expertly designed organic sleep sack and discover a happier, more rested household.