Call a vet or bird rehab center I am caring for a 6 day old sparrow till I can get something to get it close to the nest so the parents can feed it but use an eye dropper or something to get the food in the mouth careful not to damage its beck or mouth I'm feeding this guy mushed raw hamburger meat mixed in water but it is recommended to use wet cat food or wet dog food but you must call a vet first or a bird rehab center so you know what to do give it the wrong food it may die or get very sick but baby sparrow eat high protein insects that their mom and dad bring to them.