I need some advice on a kitten . It's a stray. It has 3 other siblings and they were dumped off. This morning my husband found one of them lying outside on the ground in distress .It was really cold. Not sure what's wrong He brought it in the house and we are in process of warming it up. Seems to be breathing ok as far as I can tell. It just really hasn't come to yet. What should I do?