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Male cats hit puberty at about 9 months old. A female cat reaches  puberty at around 6 months old. A female who has reached puberty  and in in heat will be quite vocal.
A catâs first heat cycle, called estrus, happens at sexual maturity â which, depending on the breed, could be when the kitten is anywhere from 5 months old (for Siamese cats, for example) to 10 months old (particularly for some of the longer-haired breeds, such as Persians).