4 Season Baby Sleep Bag Space


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Our Woolino Ultimate 4 Season Baby Sleep Bags are designed so that you need only one – regardless of the season, regardless of your baby’s age.

How do we do that?

The merino wool we use is supremely breathable, keeping your baby warm when it’s cold and cool when it’s hot. That temperature regulation means that your baby will sleep comfortably throughout the night, year-round – and that means a better night’s sleep for you too.

Our universal sizing means that it will fit a baby from 2 months to 2 years. This consistency in sleepwear will allow your baby to always associate the comfort of their sleep bag with a good night’s sleep.

So, instead of buying a different sleeping bag for different seasons, as well as buying larger ones as they grow, you just need one Woolino sleep bag for your baby.

100% Natural
Pure silky-soft hypoallergenic merino wool lining and the finest organic cotton outer.
4 Season use
Unlike other brand sleep sacks that come in either winter or summer weight/TOG rating, the Woolino 4 Season Sleep Bag can be used year-round. It’s suitable for room temperature 63-77F (17-25C). Because of Merino’s unique ability to regulate body temperature, it helps keep your baby warm when it's cold and cool when it's hot.
Grows with your baby
It has a universal size so it can be used for babies 2 months up to 2 years old. And for smaller babies, simply close the underarm snaps to adjust the fit.
Excellent value
With Woolino Ultimate 4 Season Sleep Bag, you don’t have to buy a different sleep bag every few months. It is the only baby sleep bag your baby will need, in winter or summer, until they turn two years old.
Designed to be practical
It features double shoulder snaps and a two-way side zipper, so it opens up completely flat for easy dressing without waking the baby! For easy nighttime diaper changes, you can open the bottom only. It also has zipper-pull guards to protect baby's skin and to discourage them from chewing on the zipper pull.
Travel friendly
A closable seat-belt opening allows for easy transfer between stroller, car seat and crib, so you can keep your baby’s sleep routine intact while on the go.
Easy care
In addition to Merino being naturally anti-bacterial and odor repellent, Woolino sleeping bags are machine washable and can be tumble dried on 'no heat' setting. See care instructions here.
It is a safer alternative to loose blankets
Helps your baby stay covered through the night and replaces loose blankets in the crib that can cover your baby’s face and interfere with breathing. The sleeping bag also promotes back sleeping.
Naturally fire resistant
Wool is a natural flame retardant and the best fiber to have next to your baby’s body. Woolino sleep bags meet all US CPSC children safety requirements.
Woolino 4 Season Sleep Bags are made with Woolmark and Oeko-Tex 100 certified merino wool and GOTS and Oeko-Tex 100 certified organic cotton. We use nickel, lead and phthalates free YKK snaps and zippers, which are also Oeko-Tex 100 certified.
#1 rated and #1 selling merino wool baby sleep bag in US and Canada and winner of Mom's Choice Award, Creative Child's 2012 Top Choice of the Year Award, Green Scene Mom Award 2016, 2017 Eco Excellence Award, and Baby Maternity's 2018 Top Choice Award.
Free Nursery Thermometer with a dressing guide included.

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