Many types of toilet seats, or "potties," are available to choose from as you prepare to toilet train your child. Although the design details vary, the two basic options are a potty chair or a potty seat. Some seats are designed for dual use.
A potty chair is a self-contained miniature version of a toilet. It is placed on the floor and provides easy access for your child. The toilet seat where your child sits is similar to a normal toilet seat, although the waste collects in a pan or bowl beneath it and must be emptied and cleaned after each use. These potty chairs allow your child to:
A
potty
seat
attaches to your regular toilet, and waste goes into the toilet
bowl. A potty seat requires a solid step stool (often included). Many potty
seats have a backrest and grips or armrests. The seat needs to be firmly
attached to the regular toilet; a loose seat can scare a child and hinder
training progress.
WebMD Medical Reference from Healthwise