I have used this recipe and it works. It was given to me by a vet in 1983, while living on our El Centro, California Farm. I once n carted a baby kitten to work with me who had been orphaned, so that it could be feed often. I wrapped a small towel around a hot water bottle for warmth, placed it in a plastic bucket, with handle, and fed the kitten every 2-3 hours just like a baby.
You can find tiny feeding bottles at pet supply stores or use an eyedropper to feed the animal with. Take care not to choke the tiny thing with too much milk flowing out of the bottle.
1 large Egg yoke (yellow part only)
1 tsp Light corn syrup
1 small Can Carnation canned milk
water Fill milk can with water for equal amounts of milk to water
Beat the mixture very well, and refrigerate.
Warm to luke-warm or just above room temperature to feed tiny puppies and kittens.