If a kitten is stepped on its belly, it will be fine if it can continue to walk and eat normally. If the kitten has convulsions, foaming at the mouth, lack of energy, etc., it means that the cat has suffered internal injuries and should be taken care of in time. The kitten should go to the pet hospital for a x-ray examination. If it is not treated in time, the kitten will die within a short period of time.