dont worry too much. Your son has doubled his birth weight already so it should be fine. I also asked dr and bfding counsellor last time is it my breast milk not good enuff coz my dear daughter also put on wt slowly after 5 months old. But they said as long as my dear daughter is reaching appropriate milestones wt is not an issue. Anyway i'm also sure that it's not coz my breast milk not fat enuff coz when i pump out last time i can see that it's either white or slightly yellowish which means that she shld be getting enuff of the hind milk. breast milk is the best milk we can give our child so how can FM be better?