I bet your boy is beautiful and perfect the way he is. But i do think that he may be having difficulties with his lower half. At his age he should show interest in getting onto his feet, even if he is not yet fully capable. Another eye opener is his not wanting to push against your hands but wanting to curl his toes around them. I am no doctor, but it sounds to me that he is already attempting alternative movement for his lower extremities. I think you should have him observed by a specialist. This way any difficulties can be corrected earlier as opposed to later.