The answer is, it depends. I should share with you that I am a stickler about crib and sleep safety, probably more so than any other sleep coach or parent I’ve ever met. While I stand by everything I say, it’s important to understand that my number one motivation at all times is to make sure babies are always 100% safe during sleep. That can sometimes mean that I advise parents to do, or not do, things that might make it a bit harder on them, but ultimately baby is better off because they are safe.
An example would be my hardline approach on the following: if parents are asleep, babies of all ages should only sleep in completely empty cribs or Pack n Plays. Which leads me to share my thoughts on whether or not sleepsacks are safe. After 8 weeks of age, the only type of sleepsack a baby should be sleeping in is one that is sleeveless.
The American Academy of Pediatrics now advises families to stop swaddling their children as soon as baby shows signs of being able to roll over, or 8 weeks of age, whichever comes first. If you choose to transition your child from a swaddle to a sleep sack, you should only transition them to a sleeveless sleepsack.