SQ fluids could be helpful, and if its still on milk only, depending on its age, it may still need manual stimulation each time it eats for bowel care. Do you have any idea of its age? My pet racoon was eons ago before they were outlawed over rabies concerns. The milk was soaked with good quality cat food for feedings when it was time to switch over to some solids. Hoping a wildlife rehab gets back in contact with you .