After a pregnancy of 8½ months the female gives birth to 1-2 babies, seldom 3. The babies hide for three days, and after a week they can run with their mother. A pronghorn baby has grey fur, and after 3 months it has the adult fur coloring. They drink milk for 5-6 months, and start to eat grass after three weeks. Females become mature when they are 15-16 months old, and males become mature when they are 24 months old.