My family caught a newborn sparrow. It doesn't bark or understand, but it keeps its eyes open. What can it do? How can it feed?

Hello, when I was a child, I often dug birds, especially sparrows. If the sparrow is not too small, if you see the sparrow is black or a little black, it means you can feed it. Usually when they were young, they were fed pig feed, instant noodles, or worms and flies. When they are hungry, open your mouth as soon as you call them, and then feed them a little.