Can we use this on babies before 3 months of age?

My son is 13 pounds and I started with the suit a week ago at 9 weeks. It has been a miracle. He was constantly waking himself with the startle reflex and would cry as soon as I set him down. He sleeps 3-4 hour stretches which is a huge improvement.

Is this suit not a SIDS risk with over bundling? It looks like a snow suit, very thick and heavy.

It is indeed thick which is what helps keep them feeling snug similar to the swaddling effect. I've found that dressing my daughter in just a short-sleeve onesie and no socks and keeping the temp of the room btwn 69-70 degrees all winter has worked well and she doesn't get overheated. Heat escapes through the hand and feet openings, plus her neck is still exposed for ventilation. In fact, on very cold nights I added socks while she slept when her feet seemed too cold and was grateful she was cozy in the suit. We started her in the suit at 4 months old - she's now 6 months and has slept comfortably in it every single night!

How old does the baby have to be to use Merlin's magic sleep suit?

We bought a size large and started using it with our baby when he was 4 months old/17 pounds. It fit well, still fits now at 6 months old.

I received mine and it was not in the manufacturing box. Does this mean it was pre-owner?

All of our Sleepsuits that are shipped from our Fulfillment Center and Amazon come in Clear Poly Bags. Our Sleepsuits that are purchased from Retailers, such as Target or Boutique Stores, are sold in Boxes. Please let us know if you have any additional questions. Baby Merlin Company

Baby Merlins Microfleece Baby Swaddle Transition Product

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Description

🌙 Sleep smarter, not harder — the Magic Sleepsuit transforms bedtime into bliss.

SAFETY FIRST DESIGN - Back-sleeping only with clear size guidelines and breathable layers, giving you peace of mind while your little one dreams.
BREATHABLE BAMBOO BLEND - Luxuriously soft bamboo-cotton fabric keeps baby comfortable and rash-free, perfect for sensitive skin and all seasons.
EFFORTLESS DIAPER ACCESS - Innovative double zipper system means no more waking your baby for diaper changes—parenting made easier, sleep uninterrupted.
SEAMLESS SWADDLE TRANSITION - Designed specifically for 3-6 month olds ready to ditch traditional swaddles without losing that cozy, secure feeling.
CALM COZY SLEEP ENVIRONMENT - Snug fit soothes the startle reflex, helping your baby settle faster and sleep longer—because every minute counts.

Baby Merlin's Microfleece Baby Swaddle Transition Product is a patented sleepwear solution crafted for infants aged 3-6 months transitioning from traditional swaddling. Featuring a breathable bamboo-cotton blend and a snug, soothing fit, it calms the startle reflex to promote longer, more peaceful sleep. The double zipper design allows quick diaper changes without disturbing baby, while safety guidelines ensure optimal use during back-sleeping only. Trusted by thousands of parents, this sleep suit is a game-changer for improving infant sleep quality and easing parental anxiety.

Specifications

ASIN	B00WRM0KYK
ASIN	B0H1XM33JN
Age Range Description	Infant
Apparel Fabric Stretch	Medium Stretch
Apparel Fabric Weight Class	Lightweight
Best Sellers Rank	#4,057 in Baby ( See Top 100 in Baby ) #50 in Baby Wearable Blankets
Brand Name	Magic Sleepsuit
Closure Type	Zipper
Collection Name	Baby Sleepwear
Color	Pink
Customer Reviews	4.6 4.6 out of 5 stars (6,143)
Date First Available	May 15, 2026
Department	unisex-baby
Fabric Type	Polyester
Fit Type	Snug
Fit to Size Sentiment	Positive
Garment Size Country	United States
Included Components	Pants
Item Weight	0.6 Pounds
Life Event	Baby's 3rd to 6th Month
Manufacturer	Baby Merlin's
Manufacturer	HALO
Material	Polyester
Occasion	Sleeping,Sleep
Package Dimensions	10.75 x 8.75 x 0.75 inches
Part Number	MSS-PLP
Pattern	Solid
Product Care Instructions	Machine Wash
Shoulder to Bottom Hem Length	32 Centimeters
Size	Large (18-21lbs)
Sleeve Length Description	Short Sleeve
Style	Comfort, Safety
Style Number	MSS-PLP
UPC	853950005119 853950005058
Unit Count	1.0 Count

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€ 108.22

Duties & taxes included

In stock

Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Greece.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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