We've brought home our new kitten today and we were told she is 9 weeks old and given a date of birth that corresponds with this. However she seems very tiny to me, now it's been a long long time since I've had kittens around so thought maybe I've forgotten how small they are, plus I've always had large breeds. Anyway I weighed her to ease my worries and she's 512 grams which to me is way way too small! Her mother was a Asian cross type, not a full breed certainly but had Siamese facial features and I know they tend to be smaller but even so it seems too small. Could she be younger and if so what do I need to do? I'm very worried about her.