How long after mating does a hamster give birth?

A hamster has a short pregnancy, usually giving birth about 18-22 days after conception; the exact time varies by breed and size, and some may deliver a few days earlier or later. Once pregnancy is confirmed, the owner should separate the male and female immediately to prevent fights in mixed housing.

During pregnancy, provide plenty of food and water and clean the cage once a day to keep it clean and prevent infection. A few days before birth, place some fresh wood shavings and cotton in the cage for the mother to build a nest.