I have one right now that started with me at the end on nov and he was just 10 months. At that time he did not crawl, roll over, or put himself in a sitting position. He would stand at a table or some such thing but could not get down so would just stand there and cry. He could cruise around the table and if you held his hands would walk. His first week with me I would put him in a sitting pisition in the middle of the floor and put toys around him but out if reach so if he wanted them he had to go get them. In less then two weeks he was crawling. When I changed his diaper I would leave him there for a bit and when he started to cry I would take his one leg and cross it over his body to show him how to roll over. After about two or three weeks he finally flipped over himself. He was here probably 4 weeks when his mom told me he rolled over in his crib in the night for the first time. After about 6 weeks they told me he pulled him self up in his crib for the first time .... He was over one at this point. Three weeks ago after many weeks of tears he learned how to go from a standing position back down to the floor. This child just got helped in to the position he wanted instead jf being encouraged to do it himself .... He has come a long way in the 3.5 months he's been here. Basically from immobile and helpless to self sufficient. Now I just got to get him going up and down stairs and walking.