Hi K.,
We also had Erika in Early Intervention for some developmental delays, she has low muscle tone and crawled and walked late as well. She also had some chewing/swallowing issues...and currently, she has caught up dramatically but she still does have some speech problems. She does alot of talking but I don't know half of what she is trying to say, although she must know b/c she'll repeat the same word over and over and over...I feel terrible. She also gets very frustrated and will slap herself in the face of clench her hands and her jaw really tight.
We started signing with her when she was a baby and she picked up on all of them, but now the uses her words for most of her signs, so they have phased out, but have been trying to learn new ones so she can communicate more until she knows how to say what she wants.
Most importantly, EI told me to MAKE him ask for things...put things up on the shelves and make him tell you what he wants! With Erika, I was enabling her to NOT talk b/c I was so intune with what she wanted that she would get it without having to really ask for it...so they told me to play dumb and it worked, she picked up on ALOT of words quick if that was the only way to get something.
I really hope that helps a little, EI is great and I'm sure he will catch up in no time!
p.s. I'm not sure if I'm reading the right stuff, you said you are in EI and are using signs, yet that's all the responses keep saying to do, and they keep mentioning Nevada? But aren't you from Portland? I'm so confused, but this is my first day here so maybe it's me!