When I first got him he was 196 grams. Now he is 254. He is about 228 grams empty. The initial 196 was within 3 days of feeding. So I think he gained about 32 grams so far. that is 32 grams in 3.5 months. He did skip some meals, but overall he gained about 16% in 3 months. its about 5% every month. This coming month I will keep track of his weight and see if he gains another 5%.