Dressing Guide: How to Layer Your Baby for Winter & Cold Weather Purebaby How to Dress a Baby for Sleep Year Round Guide MORI US How to dress baby and toddler under sleep sack in winter and summer. Printable chart and guide for what to wear under sleep sack. A great alternative to putting blankets on your newborns is sleep sacks and warmer onesies." Make sure your baby has room to breath while they sleep during this winter season! Get more # This January weather is seriously chilly, but that doesn't mean those nap walks and park adventures need to stop! Here's your baby winter dressing guide by temperature save this Why Scandinavians Let Their Babies Nap Outside In the Winter