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Giraffe gestation lasts between 14 and 15 months, after which a single calf is born. The mother gives birth standing up and the embryonic sack actually bursts when the baby falls to the ground. Newborn giraffes are about 1.8 meters tall.
Female giraffes become sexually mature around 3 or 4 years old. The gestation or pregnancy period for a female giraffe is about 14 - 15 months. A female giraffe will give birth to a calf that stands about 6 feet tall and weighs approximately 150 lbs. Giraffes use their long necks to reach for leaves high in trees. They only have seven vertebrae in their necks, the same as humans.