 The gestational period is around 440 to 450 days long, following which usually a single calf is born, weighing 14 – 30 kg (31 – 66 lb). The udder of the pregnant female starts swelling two months before parturition, and vulval discharges may occur. Parturition takes 3 – 4 hours, and the female stands throughout this period, though she may rest during brief intervals. The mother consumes the afterbirth, and extensively grooms the infant. The milk of the female is very rich in proteins and has low fat content. As in other ruminants, the infant can stand within 30 minutes of birth. Although generally similar to adults, newborn calves have false eyelashes, a long dorsal mane and long white hairs in the stripes. These features gradually disappear and give way to the general appearance within a year. The juveniles are kept in hiding, and nursing takes place infrequently. The growth rate of calves is appreciably high in the first few months of birth, after which it gradually declines. Juveniles start taking solid food from three months, and weaning takes place at six months. Horn development in males takes one year after birth. The okapi's average lifespan is 20 to 30 years.
