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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.
The signs of a cat in heat are very clear once you know what to look for. What Is Feline Estrus? Female cats that have not been spayed undergo reproductive hormonal changes in preparation for breeding. This process is called estrus, or heat, and typically begins around six months of age. In general, cats experience estrus twice a year in the spring and fall. They may enter heat repeatedly during each season. An unspayed female cat of breeding age is called a queen. When the queen goes into heat, she experiences specific bodily changes to indicate to males that she is receptive to breeding.