Video: Baby dolphin calf birth captured on camera Dolphin mother Allie, 26, was in labour for several hours before the female dolphin calf was born weighing 40 lbs and measuring three-foot long. Brookfield Zoo filmed the birth using cameras under the water in the dolphin pool. The footage shows only the tail of the calf protruding from the mother before the baby is pushed out into the water. The new dolphin can be seen swimming around her mother and rising to the surface for air.