The gestation period for pigs averages 114 days, although pigs can be born a few days earlier or later. An easy way to remember the gestation period for pigs is that it lasts approximately three months, three weeks and three days.
Female pigs tend to give birth to large litters. Although the exact day of delivery cannot be predicted, signs that a female pig is about to give birth include nesting behaviors, such as scooting around in her bedding or straw to find a soft and warm spot to give birth. The pig's belly may drop and look as if it can touch the ground, and her vulva may swell or emit a dark discharge.