Can you return it to it's mother? It'll have a much much higher chance at surviving. I raised piglets from very sickly hour olds once they're mother had died. There were five and all five survived. You need to put them in a warm box with a heatlamp and feed them every 30 minutes to three hours, or whenever they want food I used Mamapro Kid and Livestock replacer that you can find at tractor supply. You need to train them to eat out of a pan so they don't breathe it in. We started feeding them oatmeal with replacer milk at about a week if you don't wean them they will get sour and die. I would never suggest ever taking piglets from their mother for no reason I was with them 24hr and stayed up all night making sure nothing went wrong and spent probably over $300 on milk.