What do you feed a baby muskrat that has fur but its eyes are still closed?

A baby muskrat with fur and closed eyes is likely still very young and requires a diet high in fat and protein. You can feed it a mixture of high-quality kitten milk replacement formula (KMR) or goat's milk, as they provide the necessary nutrients. Additionally, you can offer small amounts of soft, mashed fruits and vegetables, like peas or sweet potatoes, as they begin to transition to solid food. Always ensure the food is appropriate for the age and health of the muskrat, and consult a wildlife rehabilitator if possible.