My mama cat, Kitty, had kittens about 4 days ago and she seems absolutely miserable. She feeds them and keeps up with them, but when I check on her she always looks sad. Whenever they sleep, she gets up and walks around, looks out the window, eats, and whatever. Then, as soon as one cries she runs back. Also, when they cry she sits on them. Is that normal? To sit on the little babies? I know I probably sound crazy, but she is just not herself at all.