Elephants don’t just have big babies — they have the longest pregnancy of any land animal on Earth. A mother elephant carries her calf for roughly 22 months, almost two full years, before giving birth to a 200-pound newborn that can stand and walk within an hour. Here is exactly how long elephants are pregnant, why the gestation period is so extraordinarily long, and what happens when the calf finally arrives.
The short answer: an elephant’s gestation period is about 22 months (640–660 days) — the longest of any mammal on land. African elephants average ~640–673 days; Asian elephants are similar, up to around 22 months.