Should I be concerned? My son is 7 1/2 months and still doesnt crawl or scoot. If he gets up on his arms, his legs are stretched out, if hes on his knees and and his butt in the air, the front goes down. He does however take off like a shot in the walker. He sits up when I sit him up and can maintain that balance and reach for toys, but if hes in a laying position he cant get into a sitting position. Some people are telling me that it could be cause hes too big. (at his 6 month checkup he…See More