I've always been amazed at how quickly my kindergarten students learn and remember things. I'm even more amazed now at how quickly my daughter (and other toddlers) do the same!
Yesterday we were working on this puzzle, so I pointed out the two shapes she didn't know (trapezoid and pentagon). She picked up on it right away and surprised her daddy when he got home.
This morning she went straight to her puzzle and exclaimed, "trap a oid!" and took the piece out. She walked around with it saying, "trap a oid, trap a oid." She even asked me to sing the trapezoid song (eh, okay?)