S.H.
Sounds just like my daughter, who is now 22 months old. At her 1 year check up her dr also suggested pt for her. She was not pulling up, not crawling..she did the army crawl too. She couldn't get into a sitting position from laying, etc..pretty much everything you described. We did get her evaluated, she qualified for pt and ot. However, they took so long to get the ball rolling with it, that by the time they called us to set up any appointments, Ashlynn started pulling up, crawling, sitting etc. We just said forget it to the therapy since she seemed to be progressing on her own. She now is walking and seems perfectly fine. The only thing she still does is walk with a bit of a stomp, but I think she will grow out of that, when she runs it is more heel to toe. Anyway...I just wanted to let you know that you are not alone, and I know how worried I was when my daughters doctor suggested pt for her and said she had low muscle tone. Hang in there. Oh, i should also say that my daughter was almost 20 months before she started walking...and there is no stopping her now. At her 18 month check up, her doctor wasn't as worried becuase had started crawling with her belly off the floor, and pulling up and cruising. She said that if she wasn't walking by her 2 year check up that we should get her re-evaluated. I did do some "excercises" with her to help her strengthen her muscles (had her push against my hands, etc)...not sure if that helped at all. My daughter has always been one to do things in her "own time" when she wants to do something she'll do it, when she doesn't, there's no making her. When she realized that she wanted to keep up with her big brother, and to do that she needed to walk, i think she started trying more..if that makes sense?
Anyway, I hope that wasn't too long winded, just wanted to let you know that I know what your going through. Have you made an apt to get him evaluated yet? I would be interested to hear what they say.
S.