How does a pig give birth?

Mothers will make a nest in the bedding floor to give birth on, her vulva will loosen and redden. She will lay down and get up until she is ready to give birth. Once parturition begins she will have a contraction, the first will be born, then after that piglets will be born about ever 2-5 seconds until she is finished. Piglets will begin walking almost right after being born and begin to nurse.