Skip to content
100% MERINO WOOL, HYPOALLERGENIC
FREE SHIPPING ON ORDERS OVER $65
10% OFF SITEWIDE!!! USE CODE SLUMBERPEA25 AT CHECKOUT.

slumberpea

Pure Colors' Growing Together

Merino wool sleep sacks in four colors for all-season comfort.

slumberpea

Stop Worrying' Start Sleeping

No need to worry about the baby being too cold or too hot.

slumberpea

Naturally Warm' Never Too Hot

Nature's Comfort, Everywhere Baby Goes.

Why Choose Slumberpea?

Temperature Regulating

Merino wool naturally regulates temperature—keeping baby warm when cold and cool when hot.

Grows with Your Baby

Universal size fits baby from 2m - 2yrs, saving you money. Simply close the underarm snaps to adjust the fit.

Safe & Hypoallergenic

With fibers finer than 24 microns, Merino wool is gentle on skin and naturally inhibits bacteria growth.

New & Modern Design

Shoulder snaps, two-way zipper, and seatbelt slots allow for easy dressing, changes, & transfers.

Australian Merino Wool Baby Sleep Bag - Passive Temperature Regulating | Oatmeal

Type: baby sleep bag

Australian Merino Wool Baby Sleep Bag - Passive Temperature Regulating | Oatmeal

Regular price £74.00
Sale price £74.00 Regular price
Australian Merino Wool Baby Sleep Bag - Passive Temperature Regulating | Sage

Type: baby sleep bag

Australian Merino Wool Baby Sleep Bag - Passive Temperature Regulating | Sage

Regular price From £74.00
Sale price From £74.00 Regular price
Australian Merino Wool Baby Sleep Bag - Passive Temperature Regulating | Celestial Blue

Type: baby sleep bag

Australian Merino Wool Baby Sleep Bag - Passive Temperature Regulating | Celestial Blue

Regular price From £74.00
Sale price From £74.00 Regular price
Australian Merino Wool Baby Sleep Bag - Passive Temperature Regulating | Mauve

Type: baby sleep bag

Australian Merino Wool Baby Sleep Bag - Passive Temperature Regulating | Mauve

Regular price From £74.00
Sale price From £74.00 Regular price

Recommended by

"The passive temperature system eliminates guesswork for parents. No more layering anxiety—this sleep bag adapts automatically to your baby's needs."
"The thermoregulation technology impressed our experts. Merino wool's natural fiber structure responds to temperature shifts faster than traditional sleep bags."
"Worth the investment. The all-season design and two size options mean you won't need multiple sleep bags as your child grows."
"Hypoallergenic and chemical-free—ideal for babies with sensitive skin. Our panel noted zero irritation even after extended use."
"Superior breathability prevents the stuffy feeling common in conventional sleep bags. The moisture-wicking properties keep babies comfortable all night."
"A game-changer for nighttime comfort. The passive temperature regulation actually works—our testers reported fewer wake-ups due to overheating or cold."
"Finally, a sleep bag that ditches synthetic materials without sacrificing performance. The merino-cotton combination is both sustainable and effective."

Advantages of Slumberpea

Regular sleep sacks trap heat and moisture, leaving babies uncomfortable and parents exhausted from constant checking. Slumberpea's merino wool sleep sacks naturally regulate temperature, wick away sweat, and grow with your baby for 2+ years.

Australian Merino Wool Baby Sleep Bag - Passive Temperature Regulating | Sage
Regular price From £74.00
Sale price From £74.00 Regular price
Free Shipping
Money Guarantee
Flexible Payment
Online Support
Return within 15 days
slumberpea

Pure Comfort, Naturally Regulated

Our Partners

Our Partner

Shop skincare set

Level up skincare routine with the bundle

1
Australian Merino Wool Baby Sleep Bag - Passive Temperature Regulating | Mauve
Regular price £74.00
Sale price £74.00 Regular price
2
Australian Merino Wool Baby Sleep Bag - Passive Temperature Regulating | Sage
Regular price £74.00
Sale price £74.00 Regular price
3
Merino Wool & Organic Cotton Toddler Blanket- Passive Temperature Regulating,52.5" x 40",Oatmeal
Regular price £82.00
Sale price £82.00 Regular price
slumberpea
Pure Colors for Pure Moments

Grows With Every Milestone

Adjustable design adapts as your baby grows—2 months to 2 years in one timeless shade. Simple, natural, enduring.

Shop Now
New Season Essential
Rescue Your Skin
Made with love
New Season Essential

Over 2,000 Happy reviews

Elizabeth R.

Verified Buyer

This is our fourth slumberpea sleep sack, and we love these! I love the toddler sleep sack to keep the older ones warm at night. I buy these for every baby shower after someone gifted us our first. It gives me peace of mind that my two kids are comfortable all night long, and I love that I don't have to buy a new size every 3 months.

Isabella K.

Verified Buyer

My little one is obsessed with this sleep bag. He loves zipping it up by himself. It keeps him cozy and warm throughout the night. I am not fighting this blanket battles anymore. I also love to know that he is not overheated or cold since the natural fabrics (merino wool and cotton) regulate the temperature better than fleece or polyester. You will get the best bang for your buck!

Kimberly J.

Verified Buyer

Truly an all weather sleep sack. Winter/summer just follow the temp guide and you’re all set. Excellent quality as well. We have tried soooooooo many brands from all over the world and this is our go to. We have ordered multiple sleep sacks from them and now a blanket too!

Ella J.

Verified Buyer

This clay mask deeply cleanses my pores and leaves my skin feeling smooth and refreshed. Perfect for weekly use.

Danielle S.

Verified Buyer

I love how I don’t have to worry if my baby is hot or cold anymore! These will last him awhile. And the customer service is great.

Alexandra M.

Verified Buyer

We love this sleep sack! My baby sleeps better with this on, love that it’s four season and we can take it in the stroller with the buckle openings. Will be buying more of these as they truly are that good. I am happy it’ll last a while and will not require me to change weights per season.