At 15 months my son reached his signing explosion (see actually data above). In fact, there was a time when we literally ran out of signs-on-the-go. We weren’t working on anything and yet it was clear that he was interested in signing even more because he’d “talk” about the things he didn’t know and try to say them verbally. It was time to ramp up our efforts because he couldn’t say the words yet. When did you know your baby was in the signing explosion and what did you do about it?