What should you feed to a baby zebra finch that has been seperated from its parents?

How old? Is he feathered? If not feathered make sure you keep him warm by making a makeshift nest and putting himin nest and then in a box or aquarium with a heating pad set on low. Needs to be fed every 20 -30 mins from sun up to sun down. If no feathers need to feed handfeeding formula can get at petsotre. Ask clerk. I use kaytee handfeeding formula. If he has feathers. look up proper diet . I would pick up finch food at petstore and set in a shallow dish. watch to see if he eats on his own. If he is not feathered do not give water. If he is you can put down shallow little cap of water. even if he is eating on his own he may gape for you to feed him which you can do but not as often. You may want to call pet store and see if they have some foster parents they can put him in with. Good luck.