We were at a show on the weekend and still are surprised by the number of people not yet familiar with sleep sacks. We spent alot of time explaining how sleep sacks are recommended by SIDS organizations as a safer alternative to baby blankets. Then of course people wonder if there baby will be warm enough without also using blankets.
Previously we blogged about layering underneath the sleepsack - heavier pajamas for the winter and lighter weight, or just diapers for the warmer months. As well, you can get different weights of sleepsacks from one layer cotton ones to heavy down baby sleeping bags.
Ideally you want to just use the sleep sack and no other blanket, so its good to match the sleep sack with the season and with your baby's room temperature and then layer underneath it accordingly.