You mean for the potty? She is too little, she falls through the seat. (It's pretty early for potty training, but she is interested in it.) We do also have a step.

Kohler makes a great kids seat. Probably not small enough for initial potty training, but it worked quite well for our household toilet until our child was about 6. Now it's on a toilet near the rec room, for guest kiddies.

Upside is it soft-closes, so as to not BANG shut.