Breeding Chinese Hamsters is much simpler than breeding Syrian Hamsters as they will live together in mixed sex pairs or groups and breed naturally. Pairs or groups are best established at a young age as introducing older hamsters can often result in fighting.
If kept together in mixed sex pairs or groups Chinese Hamsters can start to breed as young as 1-2 months old, but more usually will start to breed at around 4-6 months of age.
Breeding Chinese Hamsters should not be undertaken lightly as being kept together they can produce a succession of litters as little as 3 weeks apart. Although they may occasionally have a break in between litters and may not mate so often, if at all, over the winter keeping a mixed sex pair or group often means a succession of babies produced.
Females often become sterile at around 12 months of age but males usually remain fertile for most of their life.