DS hated tummy time as a baby so I tried it but didn't push it. He is 7 months next week and can sit up very well unaided, so naturally now wants to lean right over, almost like he will crawl - except, when he inevitably falls over from that position, he just lays there with his arms out and doesn't even try to lift himself up. He can't roll on his front either. I should have pushed the tummy time more but thought it would all just come naturally. I feel awful.