The best thing to do if the nest is still there is put the babies back. The mother can not smell people on them (that's an old myth) and should come back to feed them. If the nest isn't intact, she can try using a small basket or box which may work...the parents really want to respond to the babies' chirping. Do wear gloves, most wild birds have mites or lice but they don't live on people...only on birds. But still, use gloves.
If the parents don't come back and start feeding them within a day, then best thing to do is try to call a wildlife rescue place if you have one. Baby birds have to be fed SO often that it's a challenge to raise them. One thing though...since both house sparrows (used to be called English sparrows) and starlings are invasive, rehab places such as Audubon won't take them. I speak from experience, having worked taking care of baby birds as an Audubon volunteer. Also, if the babies have "fledged" they will be out of the nest and the parents will still come back to take care of them until they can fly. Good luck!
