Cats typically begin their heat cycle, also known as estrus, around seven to eight months of age. However, the exact timing can vary depending on the individual cat's physical condition. Some cats may not experience their first heat until they are a year or even a year and a half old.

The onset of heat in cats is primarily linked to their individual physical development. While many begin around seven to eight months old, some may have a delayed start, reaching sexual maturity closer to one or one and a half years old.
Generally, cats become capable of reproduction when they reach sexual maturity, typically around seven to eight months of age. This is a normal physiological process after a cat reaches puberty. Female cats are seasonal breeders, generally experiencing heat cycles approximately every three months. Male cats, on the other hand, are induced ovulators; their heat cycle is triggered by the scent of a female cat in heat or by her vocalizations.
It is generally not recommended to breed cats during their first heat cycle. Their bodies may not be fully developed, and early pregnancies can easily lead to complications such as difficult labor (dystocia). If your cat reaches the age of sexual maturity and shows signs of being in heat, such as decreased mood and appetite, it is best to use toys and interactive playtime to help them cope with the period. This can help distract and manage their behaviors during this hormonal surge.
During a cat’s heat cycle, it is advisable to reduce their food intake slightly and increase their physical activity. This can assist in diminishing their focus on breeding and manage behaviors related to estrus.
Ultimately, if you do not intend to breed your cat, it is advisable to spay or neuter them before they reach sexual maturity. This surgical procedure will prevent unwanted litters and eliminate the issues surrounding the heat cycle.