Hi Lena- it is my observation that they all grow at different rates. I have year olds and nearly year olds who range from a tiny 209g (problem child) to a hefty 1200g Most are in the 500-900g range.
WOW 1200 grams?! That sounds huge. I thought my male was big (compared to the female anyway) I just wanted to be sure that I'm on the right track with them.
BTW I love your observations! Your posts are always helpful and overflowing with info!