Moon, M.D., an investigator with the Child Health Research Center at the University of Virginia School of Medicine. “Just because you would prefer a softer mattress does not mean that your baby would,” says Rachel Y. One of those practices: Placing baby (on their back) on a well-designed and firm crib mattress. However, there are many different types of crib mattresses available, all that are perfectly safe for baby but vary when it comes to their material and a few other key areas, such as how easy they are to clean or what type of crib they’re made to fit.įollowing safe sleep practices set forth by the American Academy of Pediatrics (AAP) is crucial for helping lower the risk of sudden unexpected infant death (SUID). You probably already know that crib mattresses are designed to be hard and firm in order to keep your little one safe while they sleep.