My boy is a shrimp, not quite a year and probably only just breaching 200g on an empty stomach. That's with consistent feeding and excellent feeding responses. Your girl is lined up to be bigger than him before she even hits a year. Sounds like decent weight gain to me-- she's certainly not obese! =] Expect to see some surprising growth spurts as far as length goes, Magnus hit a huge one at probably 5 or 6 months old.