I got 2 new kittens a little over a week ago, they are 9 weeks old now. The poop is green in color, and the one little boy has very runny stool and the little girl's stool is green but a little more solid than the little boy. Is this normal, should I change food ( they get science diet for kittens dry food, and they get a couple of different wet food, nutro cat, science diet, and wellness, all for kittens). Let me know what you think. They are going to the vet next week sometime for there shots and I will talk to the vet about it but if I should be worried about it now then I will go sooner. BTW he is not acting sick, he eats drinks and plays like a kitten.