IIRC, an infant or toddler, down below in an enclosed cabin is not required to wear a PFD in most states... your state may vary...so check to be sure. On deck or in the cockpit, even with an adult carrying them, it is usually required... as it is for most children under 12 in most states.
Soul searcher's point about nausea is a very valid one... some children don't mind the motion at all, and other can't adjust to it at all.
__________________
Sailingdog
Telstar 28
New England
You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Captain Malcolm Reynolds, Serenity (slightly edited)
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