rollover...then no rollover...why?

[moreandmore]

My 5 month DS started to rollover from stomach to back about 4 months ago. He's done them about 2 dozen times, but only on about 3 or 4 occasions. He holds himself up well on stomach - mini press ups! - so I know his neck muscles are strengthening - but he doesn't seem to roll over more regularly. It's about a week since he last did it. He also hasn't rolled over the other way yet.

Why is this? Is it a concern? Or am I a neurotic mum to PFB?

DD only ever rolled over one way and she is a fully walking, jumping, hopping 2 year old!
I also think that once she'd mastered the roll (one night, rolling over and over all bloody night) she wasn't that bothered by it. She did it a few times and then moved onto next stage IYSWIM.
Don't worry about being neurotic I am still a bit with Dc2! :)

DS mastered this about 6 weeks, then hadn't done it again for weeks. Yesterday and today he's rolling for England again. I think once they've mastered a skill they don't feel the need to do it any more, until it seems appealing to them again. Don't worry - all perfectly normal.

Once DD1 started rolling she never stopped, she used it as a way to get around and was a bloody nightmare! DD2 learnt to do it about the same age as DD1 but very rarely did it again- she just wasn't that bothered about moving around and was happy to just lie in one spot and play. Same with crawling- DD1 was off like a rocket as soon as she figured it out, DD2 is much more laid back and just does it when she wants something. Just enjoy having a more chilled out baby!