How birds feed their babies?

ifyou have a wild bird get a cup and take and egg crack it so the stuff in side comes out becarful 2 make sure there isn't any eggshell..then take some milk add them 2gether in the cup and mix... tillits a yellowish color ....if u cant get the bird 2 eat take some of the food and put it on ur finger then put it up to the birdeis mouth.. i have done this b4 .... its fun...