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Baby hippos are born underwater at a weight between 25 and 45 kg (60-110 lb) and an average length of around 127 cm (50 in) and must swim to the surface to take their first breath. A mother typically gives birth to only one hippo, although twins also occur. The young often rest on their mothers' backs when in water that is too deep for them, and they swim underwater to suckle. They also will suckle on land when the mother leaves the water. Weaning starts between six and eight months after birth and most calves are fully weaned after a year.[8]

Because of their enormous size, hippopotamuses are difficult to weigh in the wild. Most estimates of the weight come from culling operations that were carried out in the 1960s. The average weights for adult males ranged between 1,500-1,800 kg (3,300-4,000 lb). Females are smaller than their male counterparts, with average weights measuring between 1,300-1,500 kg (2,900-3,300 lb).[8] Older males can get much larger, reaching at least 3,200 kg (7,100 lb) and occasionally weighing 4,500 kg (9,900 lb).[24][25] Male hippos appear to continue growing throughout their lives; females reach a maximum weight at around age 25.[26]

Hippopotamuses give birth to one calf after an 8-month gestationperiod. A female hippopotamus will go off by herself to have her baby. She will then stay away from the herd for anywhere from 10 to 44 days. The baby hippopotamus is born alive and underwater. Its first act is to swim to the surface so it can breath. The mother hippopotamus takes care of her calf, nursing it underwater and occasionally giving it a ride on her back. Female hippopotamuses will also watch over groups of calves.

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14y ago

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