House sitting for my grandma and I heard a cat in her ceiling. Pulled her down and after some research can say she is between 3-5 weeks old. I got kitten formula as I know she's in the between stages of formula feeding and weaning off of it. She likes to chew on my fingers (like I can put my finger in front of her face and she'll just start noming away lol),can anyone tell me what that's about?