We've gone through several wet-suit "shorties" for our daughter, now 15. Several we received from other "kid boats" who's children
had outgrown them and several we passed on ourselves. They do wear quickly, however, so two or three cycles is about all one can expect. They are important however, particularly gloves and booties, as there are some mean and nasties in tropical water
tend to be a little less careful than adults.
I also suggest you carry a squeeze bottle filled with ammonia in your medicine chest to treat stings from jelly-fish (sea nettles) and fire coral
and the like as well as alcohol, peroxide and lots of neosporin together with water-proof "new-skin" You'll need them.