If it's not hairless and it's eyes are open, it's big enough to start tasting solids on it's own. You can offer moistened cat food, bread, crackers, cherrios, etc. At three weeks they can be weaned, and I would bet if you found it out of the nest that it is at least 3 weeks old. If it is moving around, has it's eyes/ears open, it should do fine.
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NMGA miniature meat goats, Silver Fox and NZW Rabbits, Muscovy ducks, several breeds of chickens, fancy mice and rats in Michigan