Instructions
Look for nesting behavior. When a fancy hamster becomes pregnant she will start preparing her nest by cleaning it and adding extra cushioning and chips. When you notice this behavior, make sure you clean the rest of the cage so it's ready for the babies' arrival.
Notice if she becomes aggressive. Just before she gives birth the hamster will become restless and even aggressive. She might attack male hamsters in the cage. There is good reason for this as male hamsters are known to eat their young. Remove them from the cage.
Monitor her eating habits. The fancy hamster will start hoarding food and hiding it in her nest. She will also eat and drink more when she is pregnant.
Check her stomach and rear for swelling. Her rear should swell, though this may not be perceptible until the last couple of days before birth. Make sure you don't touch her or pick her up at this time. She may also expel some blood, but don't be alarmed; this is normal.
How to Tell If a Female Fancy Hamster Is Pregnant
It can be difficult to tell when a fancy hamster is pregnant. The gestation period is only 15 to 16 days and the mother's stomach may not swell until just before she gives birth. Thus, knowing the behavioral clues to her pregnancy will allow you to prepare for the babies and care for her during the gestation period.