Nevertheless, they may not be suitable for very small infants. The following is a list of some infant-sized approved devices. If you select one of these, we strongly recommend that you try it on the child in a pool before you go boating. Because of their varying body types, it can be difficult to make a PFD that is satisfactory for all infants. The child 's temperament and comfort in the water are also factors.
Some children relax to float face up.