Re: 9 month old won't stay on belly?
I don't see what the problem is. I would leave him, he's mobile, he can get around, and he is doing what he wants to do. I would put him to sit up more often instead of tummy time. Neither of my kids ever did much tummy time, both sat well unsupported before 5 months, rolled both ways by 4 months, and my first crawled at 7 months, the second one is almost 7 and just about crawling as well, so I guess she does tummy time now, lol. But only because she pulls herself from sitting onto her tummy. If he is normal in every other way, I wouldn't force him to do anything!