The baby's look just like the adults only smaller. My sump is full of em. They could be confused with a limpet, but the limpets in my tank move extremely slow, whilst the stomatellas are like little acrobatic snails that move very fast, and, at least in my opinion, show alot more awareness than snails (they will try to hide from me and escape intelligently if I get near them). That being said, I think once you get down to a few millimeters in size, you will find a huge diversity of mollusks and pods you had no idea were there.
-Tre