Rolling over

**I'm looking to know that we're not alone more than I am looking for advice, not being rude...I've just already done the research and do what I can. Just hope somebody is in the same boat!**

My son was born 8-31-16 (4.5 months). Please tell me he's not the only one NOT rolling back to front yet 😔. He use to do front to back multiple times a day when we did tummy time but he's since stopped and still hasn't done back to front.

I know all babies develop at different rates but I feel like for almost 5 months old he should of done it at least once. He definitely tries but doesn't even get half way up. I feel like I'm the one doing something wrong 😢. We do tummy time daily (as much as he'll tolerate) mixed with play time on his back to give him an opportunity to try to roll. Everything I've read says tummy time helps build the back muscles so he can roll both directions but he just seems like he's not even close to rolling. Meanwhile, other babies not much older are already sitting on their own.

Again, I KNOW babies develop at different rates. It's just hard because I blame myself for where he's at.

PS- doctor says he's fine. I'm just a worry wort that needs reassurance 😣👎