We love this crib mattress because it can be used through several stages of early life. There is a firmer side for newborns and a softer side for older kids who are turning on their own. It also fits all standard cribs as well as toddler beds!  The cover is water resistant and removable so that you can wash it whenever accidents happen.  The material is super breathable so my baby sweats a lot less on this mattress than she did on the previous one.  Overall, this is a must have for your little one!