Just curious how other babies are doing in this area. My son is now 6 months old and he rolled over a total of 5 times back at 3.5 months and never again. He sits up (supported) very well, likes to stand and jump but seems completely uninterested in rolling over. He will cry after 20-30 minutes of tummy time till I roll him over or pick him up. My MIL told me he will not be able to crawl or sit up alone if he doesn't roll over.
Re: Rolling Over
DS#1 born 02/19/2013
My first was very different. He loved sitting but didn't get rolling until he was five months. He'd hated tummy time and would just lay there and scream until he threw up. Right at six months he started sitting up completely on his own and shortly after figured out to scoot and roll everywhere but skipped crawling until after he could walk.
Since we had such a hard time getting DS to do tummy time, we did a lot of the colic carry with him to help develop those muscles. We also tried a tip from a mom in his birth month board and did the rolly poll game. He loved it and shortly after started getting better at rolling. You lay them on their back on a blanket, gather the sides up and use the blanket to very slowly guide them in rolling side to side while you talk and make funny faces. It helped me even just feeling like I was doing something to encourage his development rather than obsessively worrying about it.
Our other girl couldn't care less about rolling right now. She can do it, but would rather scream at us. She's much more into grabbing at things right now.
Both love to stand and bounce. Neither can sit unsupported yet, but do very well with just a little support.
One of the cool things about twins is watching two babies develop so differently!
I wouldn't worry, he'll get there on his own time. Keep doing tummy time, encourage him to roll with toys or your face, whatever sparks his interest!