You mas ask, first sign of what? Actually it’s the first sign of communicating with something other than pointing. We are trying to use more signs with Sean now and have introduced several, all in all seven or eight. Some of them are so easy and self-explanatory that you wouldn’t even consider them signs, since everybody uses them anyway. Like for "stop" or "come" or "ball". Sean was sick today and John gave him a bath while I was gone. When I dressed him for bed this evening I asked him "Did you get a bath today?" and made the sign for "bathing". And guess what! He made the sign for bathing, too. Over and over again and thought he was extremely clever, which HE IS. I was so proud of him and praised him so much, which made him even prouder of himself, until we got into a whirl of praise and pride, LOL. He is such a smart little lad.
This is such a great news. I am sure he will add more signs to his vocabulary very quickly. This is so nice to have more words to communicate with him.