I don't remember when I switch my boys from the baby tub to the regular, but Kiersten is starting to ooze out of the baby one. It's so funny I put what I think is enough water in so she will be covered, but I alway guess wrong and the tub overflows (I put the baby one in the big one). I just feel that she's not stable enough to really sit in the big tub. Any suggestions for what I could do? Oh, bath rings aren't really an option, she's chubby and I don't think she would fit well, maybe you recall the pic of her in a bumbo.