Some different breeds of hamsters can be bred, but you must wait until the hamster reaches adulthood. However, some different breeds of hamsters cannot be bred. Hamsters such as in-law hamsters, third-line hamsters, bear hamsters, and flower hamsters are completely mismatched in size and shape and cannot be reproduced. Even if they are reproduced, they will suffer from diseases and have a short lifespan.

Characteristics of pregnant hamsters:
1. After the female hamster becomes pregnant, the teats will become larger, and you can feel obvious hard lumps when you touch them with your hands.
2. The temperament of female hamsters changes after pregnancy, and they are usually more irritable and have certain aggressive behaviors.

3. After pregnancy, the female hamster overeats, drinking water and eating significantly more.

4. The female hamster will see a significantly enlarged belly about 1 day after pregnancy.

5. After the female hamster becomes pregnant, she begins to build a nest in a remote place.

7. After the female hamster becomes pregnant, she will lick her PP more and more often.