This toilet step stool has a half-circular cut and removable top plate to match the toilet bowl and allow your child to pee down to the side of the bowl so it is less likely to spill and perfect for potty training. You can also use this step stool to relieve constipation. If your child grows and no need for a step stool, you can reinstall the semicircular top and use it like a regular step. It also comes with a fitting leg, so you can adjust the height. Multi-functional and convenient step stool.