Are any of your 5-6 month old babies not rolling over? I know all babies hit milestones at different times. I'm not worried but I am

I roll him around on the floor when we play and he enjoys it but he doesn't seem to be in any rush to do it on his own.
Re: 5.5 month old not rolling over
A occassionally rolls belly to back but its not like he does it all the time and he's never rolled back to belly. I think its a little wierd but I'm not stressed. He pushes up well on hs tummy, is starting to try to scoot, can sit unassisted for short periods, loves to stand with help...
As you said, all babies are different in terms of when they hit milestones. Some even "skip." For instance, my niece never really got the hang of crawling but she started walking at 8 mos.
He's growing up, but he'll always be my baby!
Nathan--11/4/10
...big brother to...???? Due March 2014!
Same. He rolled belly to back like 3 times when he was about 12 weeks old, but hasn't done it since.
I asked about it at his 4 month appt, and the ped said it's not a huge concern, but to mention it at his 6 month if he hasn't rolled again.