Are their eyes open? If not they are only a few days old--go to the store and get the kitten milk stuff because they need that for a while--the can tells you how long to feed it to them--if you can take them to the vet
You can get some cat milk, or lactose free milk and give to the kittens . Also you can give them some baby food to eat, then try giving them some moist food, if need be prime the so called pump by force feeding them a small amount of cat food from the back of a spoon handle then watch them go to town on their own!!!!