Woolino 4 Season Ultimate Merino Wool Baby Sleep Bag - Sheep


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The award-winning Woolino 4 Season Ultimate Merino Wool Baby Sleep Bag keeps your baby at a perfect temperature throughout the night, year-round. That means there’s no need to worry about which weight sleeping sack to use, or whether your baby will be too hot or cold while sleeping – they’ll always be just right!

Made with super-fine and supremely breathable merino wool, it helps keep your baby warm when it’s cold and cool when it’s warm. That temperature regulation means that your baby will sleep comfortably throughout the night – and that means a better night’s sleep for you too.

It comes in a universal size that fits babies from 2 months to 2 years. 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, right up until they turn two!


  • 100% natural: 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 weights/TOG ratings, the Woolino 4 Season Sleep Bag can be used year-round; it’s suitable for room temperatures from 63-75F (17-24C); because of merino wool’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 - for smaller babies, simply close the underarm snaps to adjust the fit
  • excellent value: you don’t have to buy a different sleep bag every few months: the Woolino Ultimate 4-Season Sleep Bag is the only baby sleep bag your baby needs, 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 and the zipper-pull guards protect baby's skin and discourage them from chewing on the zipper pull
  • travel friendly: closable seatbelt 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
  • a safer alternative to loose blankets: helps your baby stay covered through the night, replaces loose blankets in the crib, and promotes back sleeping
  • free nursery thermometer: nursery thermometer with a dressing guide included
  • #1 rated and #1 selling merino wool baby sleep bag in US and Canada: winner of Mom's Choice Award, Creative Child and Baby Maternity's 2012 & 2018 Top Choice of the Year Award, Green Scene Mom Award 2016, and 2017 Eco Excellence Award


  • made with Woolmark, Oeko-Tex 100, and RWS (Responsible Wool Standard) certified merino wool lining
  • GOTS and Oeko-Tex 100 certified organic cotton outer
  • Oeko-Tex 100 certified (tested for 100 harmful substances), nickel, lead, and phthalates-free YKK snaps and zippers

care instructions: 

  • machine wash on low (100°F max), using wool or mild detergent
  • close zipper
  • can be tumble dried on 'No Heat' or 'Air Dry' settings
  • hang to dry whenever possible
  • to refresh and reduce washing, turn garment inside-out and air often


  • we do not recommend sizing up
  • the sleep bag should be well-fitted around your child's upper body for a safe and secure fit
  • we suggest using our recommended sizing guidelines to find the correct size based on your child's age, height, and weight
  • your baby should not be below the minimum recommended weight
Woolino 4 Season size
height weight
Ultimate Sleep Bag 2 months - 2 years 23-35" (58-89 cm)

10-32 lb (4.5-14.5 kg)



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