When we were looking at purchasing a crib for our fantastically wonderful son, Chaim Yosef, there were a number of options that presented themselves to us. The one we decided to choose was that of a crib that could be changed in a few steps to a toddler bed and then eventually a normal bed in which he will sleep for most of his childhood until he eventually outgrows it. The corresponding mattress has two sides — one for the infant period and the other for the toddler and young child period. The infant side is firm whereas the other side is softer. A firm side is needed for infants to prevent sudden infant death syndrome, which is often caused by suffocating on a too soft surface.