My twins hate sitting on
a regular toilet seat cause they are afraid to fall in.
It has a removable potty ring for use on
a regular toilet seat and handles to help toddlers feel secure.
However if your little one is a mimic and want to do big things the way Mom or Dad does then a seat that fits on
the regular toilet seat may be best.
A potty seat is a plastic seat that fits over
the regular toilet seat to make the opening smaller.
As your child grows, remove the potty ring and use it on
a regular toilet seat.
Just by making sure my child's arm strength was good, (through normal play and climbing on the jungle gym etc.), I knew he could support his own weight on
a regular toilet seat; no problem at all, never fell in or anything His daycare also has the same situation as the original questioner starting at around 2 yrs old.
Stool: If you choose a potty seat that fits on top of
the regular toilet seat, you'll want a step stool for your child to rest his feet on.
It occurred to me it might be time to get a portable toddler seat that fits on
a regular toilet seat.