pronghorns have a gestation period of 7–8 months, which is longer than is typical for north american ungulates. they breed in mid-september, and the doe carries her fawn until late may. this gestation period is around six weeks longer than that of the white-tailed deer. females usually bear within a few days of each other. twin fawns are common. newborn pronghorns weigh , most commonly . in their first 21–26 days, fawns spend time hiding in vegetation. fawns interact with their mothers for 20–25 minutes a day and this continues even when the fawn joins a nursery. the females nurse, groom, and lead their young to food and water, as well as keep predators away from them. females usually nurse the young about three times a day. males are weaned 2–3 weeks earlier than females. sexual maturity is reached at 15 to 16 months, though males rarely breed until three years old. their lifespan is typically up to 10 years, rarely 15 years.