Happiest Baby SNOO Sleep Sack - 100% Organic Cotton Baby Swaddle Blanket - Doctor Designed Promotes Healthy Hip Development (Midnight Planets, Large)
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FREE 30-day refund/replacement
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
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Availability:
In Stock.
Arrives
May 8 – May 12
Color: Midnight Planets
Size: Large
Features
- #1 Swaddle New York Times: Rated Americas best baby swaddle, our SNOO Sleep Sack was designed by top pediatrician and worlds leading hip-safe swaddling expert, Dr. Harvey Karp. Perfect for healthy, growing hips (International Hip Dysplasia Institute seal of approval).
- 100% Organic Cotton: Made from luxuriously soft organic cotton with special wings that attach to our SNOO Smart Sleeper to keep babies safely on the back. Includes extra-quiet Velcro for escape-proof security and 2-way zipper that opens from top or bottom for easy midnight nappy changes.
- More Infant Sleep: Our baby swaddle sleep sack prevents startles and boosts babies sleep quality with special inner flaps that give the snug embrace your baby boy or girl loved in the womb. Arm openings can unsnap to allow for arms out. Great transitional swaddle for moving to crib with arms free independent sleep training.
- 5-Second Baby Swaddle: The Happiest Baby Swaddle is the easiest, safest, fastest, escape-proof baby swaddle wrap. It promotes self-soothing and keeps babies sleeping longer than other swaddles.
- Prevents Overheating: Breathable mesh at shoulders and legs of baby warp reduce risky overheating. More secure and comfortable than other swaddlers, blankets, or baby sleepers.
Material: Cotton
Color: Midnight Planets
Brand: Happiest Baby
Special Feature: Breathable
Style: Modern
Color: Midnight Planets
Style Name: Modern
Blanket Form: Swaddle
Theme: Planets
Pattern: Planets
Additional Features: Breathable
Recommended Uses For Product: Napping, Travel
Seasons: Summer
Fabric Warmth Description: Lightweight
Material Type: Cotton
Fill Material: Cotton
Product Care Instructions: Machine Wash
Fabric Type: Organic Cotton
Brand Name: Happiest Baby
Age Range Description: Baby
Number of Items: 1
Model Name: SNOO Sack
UPC: 817720022928
Manufacturer: Happiest Baby
Model Number: 5221SNSS120
Item Type Name: Baby Sleep Sack
Item Dimensions L x W: 9.75"L x 8"W
Size: Large
Unit Count: 1.0 Count
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
May 8 – May 12
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
We own a few different Snoo sacks, but this Tie Dye Rainbow version is by far my favorite. The 100% organic cotton feels noticeably softer and higher quality than the standard white ones. Why we love it: • Design: The tie-dye print is super cute in person vibrant but still gentle enough for a nursery. • Softness: It washed really well and stayed incredibly soft against my baby's skin. • Function: It works exactly like the original sacks (clips in easily), but adds a nice pop of color to the bassinet. Verdict: If you want to mix up the plain white look, this is a winner. Highly recommend for the softness alone!
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Reviewed in the United States on January 28, 2026 by Practical Dad
Color: Ivory Planets
Size: Medium
The Happiest Baby SNOO Sleep Sack is excellent quality. The 100% organic cotton is soft, breathable, and gentle on baby’s skin. The design makes swaddling easy and secure, helping baby feel calm and comfortable. It’s well made, washes well, and holds up beautifully over time. A great investment for better sleep and peace of mind.
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Reviewed in the United States on December 19, 2025 by Anna Derderian
Color: Graphite Stars
Size: Small
Can’t live without!! The ONLY swaddle our baby can’t escape! Extremely easy to use. Color exactly as pictured. Has lasted for several months, does start to lose velcro stick after about a month or 2 but the zipper keeps it secured. Not super warm, perfect for 70° sleeping temps!
Reviewed in the United States on December 30, 2025 by william
The print on this is so cute! It did start to fade after several washes, but the design actually looks cute faded, almost like it was always that way. We love the overall quality of the Happiest Baby brand and have never had issues with the Velcro or clips
Reviewed in the United States on February 18, 2026 by Tori
I purchased the Snoo Sleep Sack in the Teal Planets color in size small and I have been very happy with it for my 5 week old. The fabric on this version feels noticeably softer and stretchier than the plain white Snoo sacks that I also own. My baby is over 9 pounds and 22 inches long and the Small is still fitting him well while allowing him to sleep comfortably. It's so easy to swaddle him with the velcro and zip up closure. It does a great job regulating temperature. Even during winter we do not need to layer him heavily and he sleeps very well in this sleep sack. He always seems comfortable wearing it and despite being only 5 weeks he is starting to have long sleep stretches! I definitely think part of this is because of how cozy he feels in his Snoo sacks! I would definitely purchase more of these and would choose this fabric over the plain white versions due to how soft and flexible it feels.
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Reviewed in the United States on January 1, 2026 by Melisa Z.
Color: Ivory Lemons
Size: X-Large
Hello all, We absolutely love the Happiest Baby SNOO Sleep Sack! My wife has tried multiple other brands before, but this one truly made her day. The 100% organic cotton feels so soft and gentle on our baby’s skin, and we love that it’s doctor-designed to promote healthy hip development. The ivory lemons design is adorable, and the X-Large size gives our little one plenty of room to grow comfortably. It’s made bedtime so much easier and more peaceful for both baby and parents. Highly recommend to any new parent looking for a safe and cozy swaddle!
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Reviewed in the United States on January 22, 2026 by Sharifi
Color: Ivory Planets Black Wings
Size: Medium
I switched to medium once my baby weighed 11 pounds. Before than I was using the small. I usually order two of each just in case there is an accidental blow out or to switch the colors every now and then. I love how this is an easy way to swaddle my little one and like the fit between the small and medium since I have experienced both. It’s a good value for the money as they do last a long time. It’s also very easy to slip on and off of the snoo.
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Reviewed in the United States on April 3, 2026 by Brittany
Color: White
Size: X-Large
Works fine. Fits the snoo, but had a bad “packaging” smell when it arrived. Had to wash it twice.
Reviewed in the United States on November 28, 2025 by Grace