8 months old. Because female cats do not ovulate during the estrus period, ovulation will only occur after the male cat stimulates mating, so the cat will not come to "aunt". The cat's body will only change a little during estrus, but there will be no symptoms of bleeding, but clear fluid will occasionally flow out. How old does a female cat start to menstruate? Female cats usually have their first menstrual period when they are 8 months old, which is when they reach estrus, which lasts about a week.

How to take care of a cat during estrus:

1. Feeding estrus-free powder can temporarily alleviate the cat’s howling and barking behavior.

2. The cotton swab method is used. Pinch the back of the cat’s neck. You can use a cotton swab sterilized with alcohol, apply lubricant, gently touch the cat’s private parts, and slowly insert it to relieve the pain. .

3. Divert your attention, use cat teasing sticks, canned food, etc. to attract the cat and forget about the estrus response.