Hey, Just thought i'd try and offer some reassurance about slow weight gain. My ds has put on little weight over the past few months and had even lost some one month! (He's 8 1/2 months ) I have been tearing my hair out, trying to shovel food into him and worrying myself silly about breastfeeding, and how I couldn't meet his needs and whether to stop. I had convinced myself that every time he cried he MUST be hungry, however he is much happier on a routine of 4 hourly bf and I just give him as much solid food as he'll take, he's much happier.
I have a very active little boy that was rolling early just like your lo. I have spoken to the health visitor and a breastfeeding consultant from the NCT (we don't routinely see a doctor in the uk) and they have all reached the same conclusion, in light of the fact that he is perfectly healthy, developmentally fine and very active that the only problem is that he keeps being weighed and hence the worrying begins. The plan now is not to weigh him unless I feel he is unwell!!
Although it's a bit early to do this in your case, just to let you know that those charts can cause more worry than good sometimes, particularly with bf babies!! A baby that is undernourished is unlikely to be so alert, meeting (and exceeding) milestones and would not have the energy to do all that rolling!!!!!
I'd say keep up the good (bf) work!!
(My mum also told me my brother was exactly the same as my ds and he is now a very stocky 6 ft lad)
HTH