Looks fantastic Andrew. When I read that you were building something for a 2 year old, I was (guiltily) expecting something quite crude, but alas! An elegant stool that looks like it could take the weight of 100 two year olds!!
I made something a bit more basic when my kids were knee high. Used to do double duty as a small seat for while they were being supervised in the bath.
I did make this for a friend, which seems to serve similar double duty.
No issues that I have been informed of. The design was basically a copy of her existing stool. The only difference was the joinery (the original was raked legs with stretchers attached by screws in to end grain). The pattern and position of the two steps is exactly the same.