Sounds normal mate like pp said wet nappies,alert when awake etc are what you should be looking at. C was 6.5kgs at 4mths and gp said she was a chunky monkey lol, I was thinking she was small lol. Starting solids, esp BLS prob won't have much impact on weight gain. We started c last week, but she doesn't get many/any calories from it. Prob uses more calories playing with the food haha