Humphrey, almost 6 months, was playing in the water on 4/24, but it was only about a foot deep. Yesterday he was trying desperately to get a smallish toy out but wouldn't go in completely - it was the firs time his pond was up to the normal level. I would bet that by the end of the day he was in because he had each of his limbs and his head underwater at one time or another while I was watching.