My 9 1/2 month old looks WAAAY off crawling to me. She rolls a little bit (not very far though) as she seems quite happy staying put and is a placid, content baby. When do you think it would be appropriate to seek further advice about a baby who is not moving very far from the mat they are placed upon?!! She can rotate on her tummy using her hands, but does not seem to know what her legs are used for (only weight bears a tiny bit when given the opportunity to do so). Any thoughts/advice?