What does Mama bird do if one of her chicks dies?

A few days ago I found a baby bird on the ground. I didn’t think the bird had made it with the big fall he took. He fell about ten feet down but was also a few feet away from the nest. I didn’t want to leave the little guy there so I picked him up and put him back in the nest. Now, a few days later, I see some chicks stirring in the nest. I hoped one of them was the chick I saved but I couldn’t tell.