My ds is 10 months today. He sat up at 6.5 months and at 9 months started an army crawl/drag thing. He also does a bit of bum shuffling.
He doesn't however seem to be able to get from one position to another. From sitting he just reaches forward and cries until you help and from his front he can't get to sitting. He doesn't pull to standing on objects but will do on your hands.
Is this normal for his age? It seems slow and I don't know how to help him move from one position to another