I agree about 1 and 2 year old in the water. We go to the pool alot, several times a week. And, even in the wading pool wear the water is only 12-15 inches deep. The 1 to 2 year olds who can walk are the most "likely" to lose balance and "fall over". I mean you are just sitting there, watching them, maybe 5 feet away or so, some asks you something you turn to answer, an instant later, the toddler somehow seems to lose his balance and he under water. This has happened to me and several other moms so many times, their legs just don't seem to be strong enough and if they "fall over" they aren't big enough to catch themselves and get back up. Go for the life jacket, because when they go under like that, it scares them, and YOU to death!