Female red deer reach sexual maturity at 2 years of age. Red deer mating patterns usually involve a dozen or more mating attempts before the first successful one. There may be several more matings before the stag will seek out another mate in his harem. Females in their second autumn can produce one or very rarely two offspring per year. The gestation period is 240 to 262 days, and the offspring weigh about . After two weeks, calves are able to join the herd and are fully weaned after two months. The offspring will remain with their mothers for almost one full year, leaving around the time the next season's offspring are produced. The gestation period is the same for all subspecies.