Why is my baby sleep surface firm?

You have probably noticed that your baby’s sleep surface, whether it’s a full-size crib mattress or a pad for a portable crib, is firm and may not seem comfortable to most adults. But this is the way it is meant to be! The mattress or the pad for the portable crib should be covered by only a fitted sheet. There should be no other padding added to the mattress in an attempt to make it more “comfortable”. Doing so can be very dangerous for your baby.