How much weight gain is too much?

[kiiarah]

Hi guys, I have been monitoring Shesha's weight since I got him two months ago. When he came home he weighed 92 grams at about one month old. Now at three months old he weighs in at 155. It's really amazing how quickly he is growing and I just thought I should try to get an idea of what is considered too much gain too fast so that I know what to expect, and whether he is being fed properly. I read somewhere that many bps are actually overweight so I am a bit scared to base any comprisons off pictures online alone. I actually managed to find a growth chart with average weights by age and the listed average was 145 grams, so it seems like he is doing well, but I sometimes worry about not knowing the correct feeding schedule/amnt. He is fed once a week and each time he gets a rat between 10-15% of his weight. He has only pooped once since I have had him but had also shed once. Any guidelines or pointers would be very reassuring. Thanks!!