If you have retrieved an unfeathered nestling, the first priority is warmth. Follow the same procedures as above, but place the box on a heating pad set on low or medium, and create a make-shift nest for inside the box by lining a berry or food-storage container with a washcloth. If the baby begs for food, do not feed it hand-rearing formulas for pet birds, bread, milk, seed, cereal, hamburger or any other meat. As a stop-gap only, most wild nestlings can safely be fed kitten, cat, puppy or dog (listed in order of preference) kibble that has been broken into small pieces and soaked in water until soft. These foods are not nutritionally complete diets, but will do no harm for the short time it takes to locate a rehabilitator.
How to Make Baby Bird Rescue Food ..
Do not give food or water, as tempting as it may be. If the bird looks healthy and isn’t cold, and you can see the nest and can reach it, try to renest it. If the nest is too high, you can try to make a nest as high as you can with an old plastic container. Cut small holes in the bottom of the container so if it rains the nest won’t flood with water. Line the nest with grasses or a soft, dry washcloth with no strings coming off of it. Attach the nest to the tree or fence or whatever is nearby the original nest with wire or string or bolts/screws. If you can rest it on top of a branch or two, that would be ideal so when the baby fledges (leaves the nest) there will be a branch to perch on nearby. Put the baby in the nest and watch from a distance for up to an hour or two to see if the parents come to feed the baby.
What to Feed a Baby Bird for the Best Nutrition - The Spruce
If you have determined that the baby needs rescuing, whether fledglingor nestling, proceed by placing the baby in a small plastic containerlined with paper towels, and then in a box and place in a warm areaaway from pets and children. You may place the box on a heating pad seton LOW. DO NOT give the bird any food or water. Call a rehabilitator.
3 Ways to Feed a Baby Bird - wikiHow