It's possible for hamsters to vocalize before giving birth, often due to perceived environmental threats or physical discomfort. Typically, a hamster will deliver a litter of 5 to 8 pups.
Hamsters may make sounds when they sense danger in their surroundings or if they are feeling unwell. If the birthing process is smooth, they may not vocalize at all. Pregnant female hamsters are often quite anxious and require a peaceful environment to deliver their young. It's important for owners to provide a quiet setting and control the ambient temperature, avoiding any disturbances.
The vocalizations of a female hamster might become more pronounced before the actual delivery of her pups. Research suggests that mother hamsters will emit squeaking sounds, particularly after giving birth. These are strong sounds associated with the mother's instinctive need to safeguard her babies. During this period, the mother hamster often becomes intolerant of other hamsters, especially males. Placing a male hamster with a new mother can cause feelings of unease, and aggressive behavior towards another hamster is a way the mother protects her pups. It's best to return the mother hamster to her litter; when she sees they are healthy and safe, her behavior will often return to normal.