So I think I've got two giant breed kittens. I read that birth weight should be about 100g and they should gain 10g per day after that. Well yesterday the "runt" had a birth weight of 120g, the other one of 133g. Since then the runt has put on 38g to weigh 148g, and the other one 31g to weigh 164g. I assume I shouldn't be worried though, better than not putting on weight! I just thought it was funny, my little giant kittens lol.