DS was about 10kg at 6 months too (and he was rolling a lot from 4 months). His weight gain did slow down about the 6 month mark though - he was 12kg at 10 months and 12.1kg at 12 months. Don't worry about the 'diet' remarks - how ignorant! My MCHN said that they don't worry about weight until 2yrs+ in breastfed babies. They weight gain really does slow down - DS has thinned out heaps since he started cruising/walking.