Now it's dinnertime. Don't grab a bottle of whole milk. That's a prescription for diarrhea. Buy a special kitten formula and nurser at a veterinary clinic or pet supply store. The liquids are much easier to use, but if you are feeding an entire litter over a five-week period, they can be expensive.
Powdered formulas are a much better value and have a longer shelf life.
Have your veterinarian check the kittens for dehydration and evaluate their overall condition. While you're there, ask her to show you how to feed your little charges. If they are too weak, the vet may have to place a special feeding tube directly into their stomachs. Don't try this yourself unless your veterinarian has instructed you clearly in how to do it. Improperly done, the tube could slide down the trachea and send the formula straight into the lungs, drowning the kitten.