We got two kittens at 7 weeks old, we have had them for a week, and both seem to be happy. We get cuddles and purring all the time and we play all the time. Just as I speak we are laying down for an afternoon nap. But the female of the two sucks on things when getting ready to sleep. My pillow, my finger, ect. It doesn't bother me, just worrys me. Should i get some formula or a bottle for her to suck on? Both of them keep us busy and they are very enjoyable. I just wanna make sure they are healthy and okay. Our male shows no interest is sucking on stuff. Just likes to play and have fun. The little girl also seems to be having some tummy troubles. Maybe also cause of the being away from mommy?