While states might differ on this, Federal laws call for all children under the age of 13 to wear a life vest while in vessels upon moving water. Exceptions to this rule might only apply when the child is below deck (or in the cabin) or if the vessel is anchored (moored or not underway). Coast Guard regulations stipulate that these live vests must be of an appropriate size and type for the child and the activities in question. There are currently no infant-approved life vests, meaning that toddlers should always be within reach of an adult and supervised constantly.