Basically my DD is nearly 6 months and won't roll over. At about 4.5 months she suddenly seemed to 'get it' and rolled over 5 times in one day..... since then absolutely nothing! In all other respects she seems on track, except for her sitting which I gather is extremely good for her age (by 5.5 months she could sit independently for extended periods - 30 mins plus). Should I be worried if she doesn't start rolling or is it just one of those things that some babies just aren't that interested in? She did seem absolutely determined to master sitting up - it clearly bothered her not to have a good view 