Marisa, at 18 mos, understands a lot of what we say now. She's trying to communicate verbally, signing (asl), and gesturing in her own way. I've noticed that she has stopped using some of the signs she used to use regularly, such as "all done" near the end of the meal. She knows signs like "eat", "drink", "up", "more", "change", "bed". The sign she uses the most now is "more" when she wants to eat more of something. She used to use "help", but now she makes a certain noise to indicate that she wants help.
But the other day when I was doing something with her shoes while she was in her car seat, she made the "more " sign. Puzzled at first, but then I realized she was really doing the "shoe" sign which is pretty close to the "more" sign. Wow, I hadn't realized that she picked that one up! I've been making the "shoe" sign for her when I put on her shoes, same with "socks", I just hadn't expected her to sign it to me. Cool!