Male hippos choose their mates when the females are in heat, separating them from the group for mating. This mating process lasts around 30 minutes and is most common between May and July. Hippos are polygamous, meaning they have multiple mates throughout their lives, and males may mate with several females in a single season.
Female hippo births can occur both in the water and on land, with the female often seeking a relatively shallow area in the river or a secluded riverbank. After a gestation period of about eight months, the female gives birth to a single calf. These newborns, though smaller in size, are not to be underestimated, as they already weigh around 50 to 100 pounds at birth.