Fawns, or baby deer, exclusively eat their mother’s milk in the wild. Baby deer eat solid plant foods such as grass, leaves, and fruits as they grow older.
A nursing baby deer can be bottle-fed with a milk substitute if it loses its mother. Both goat and cow milk are acceptable substitutes, but goat milk is preferred. Some pet stores sell goat milk or a generic wildlife substitute milk suitable for fawns. Older deer require solid food in addition to the formula and tolerate additives like bananas and baby rice cereal. The deer eventually stops drinking milk and simply consumes plant materials.