My LO is 10 weeks old and every time I pop her on her tummy, she screams. I have pretty much given up on it now. I have her on my chest and on my shoulder where she gets to lift her head, but a few people have been v surprised that I'm not doing 'proper' (whatever that is) tummy time. She'll be ok though, right? I don't see many kids walking round who can't hold their heads up!