Initially I thought maybe they were just doing everything for him. But the mom has expressed concern as well regarding how behind he is. And it certainly looks like they're trying. He wouldn't even go down the one step into my toy room. I thought he just wanted to watch the other kids at first, until he was comfortable. Then I realized he didn't want to go down the step. So I asked his mom how he was at home with going from one level to another. They tried it at a grandparents house and he had a huge tantrum when they were practicing stairs.
Everything I noticed about his eating, his mom brought up before I had a chance to say anything to her. I just don't know how to help this one adjust and "catch up" to a normal level. Typically I see little ones change very quickly when they see older kids running and playing and climbing. They want to do all these things too.

I also see them out around town once in a while. They seem comfortable with his thumb in his mouth constantly. I discourage soothers and fingers /thumbs in the mouth unless it's nap time. It hasn't really been a problem until now.