"Mourning doves of both sexes feed their hatchlings something called "pigeon milk"--a substance that oozes from the lining of the parent's crop and contains more protein and fat than either human or cow's milk. Hatchlings eat nothing but pigeon milk until they're three days old; after that, they're gradually weaned onto a diet of seeds. The parents continue to feed the hatchlings until they're totally feathered out"
By the looks of your picture your bird is "totally feathered out" So I would think you could possible give it seed. As for what kind. At bird feeders, Mourning Doves are attracted to one of the largest ranges of seed types of any North American bird, with a preference for corn, millet, safflower, and sunflower seeds. Any Wild Bird seed will do.
Hope this helps
Also, Does anyone else have any suggestions?
Meg