My DS is 9 months old today and he is not very mobile. He cannot crawl, he has started pushing up and can just about get onto his knees for a few seconds but it makes him super-angry. My dd was well on the move by his age. He also isn't a big fan of rolling although he does sometimes. He seems very frustrated now. He's a big boy quite chubby which doesn't help I imagine although lots of big babies crawl.
Is it time to get him looked at or are we still in the range or normal?