At 20 months old, Riley is starting to recognize some of the letters in the alphabet. I first realized she knew some letters while we were walking at a park. The park had "A, B, C" painted on the ground, and she stood on top of and said "B". I was dumbfounded, so I pointed to "C" and asked her what that was, and sure enough she got it right too.
Here's a little clip of Riley "finding letters" with her dad: