Hey ladies, I am a lucky momma to 9 month old b/g twins! I've noticed my daughter started rolling over, crawling, climbing, and standing these past few months, but my son isn't mobile yet? He sits there, and wiggles and wiggles when on his tummy.. he moves by rolling mostly but not where he wants to go. I can tell he gets frustrated, but not sure how to help him anymore than I do? He is also very chubby :) he is bout 25 lbs.. and his sister is 20... I also thought once he seen her doing it he would catch on..

Any tips or ideas? is it normal for them to be at such different stages?