If you don’t know what you’re looking for, it can be very difficult to sex hamsters, especially if they’re babies. Male hamsters have 2 vents (holes) underneath them. These will be approx 1cm apart. On adult male hamsters the testicles will also be obvious. Female hamsters also have 2 vents underneath, however, these vents will be very close together, in fact sometimes so close together that they look like one.
You may find it easy to observe what sex your hamster is by putting it in a clear glass bowl. That way you can look at the underneath of your hamster.
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