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 How to dress baby and toddler under sleep sack in winter and summer. Printable chart and guide for what to wear under sleep sack. Why Scandinavians Let Their Babies Nap Outside In the Winter Winter is here! We know it can be confusing to know what sleepwear your baby needs as the temperature starts to drop. With this simple guide you can see what sleepwear is