We have this Fisher Price whale tub, and LO has been using it since he was a few weeks old. He's now almost 6 months, and he's really outgrowing it with the infant stopper in there. He arches his back over it and tries to slide down. He's also so wide in there, he doesn't have a lot of room to move his arms in that position.

He's getting pretty good at sitting up, but he still topples over unless he's in the tripod position. I'd like to remove the insert, but should they be able to sit up completely unassisted before doing that? I'd have to hold him upright the whole time. How did you handle bathtime at this age?