It is okay for cats to have 2-3 litters a year. Because cats have limited physical strength and not giving birth to a single litter will consume a lot of energy. It is recommended that the interval between each litter be 4-6 months, so 2-3 litters a year is the best. OK Female cats go into estrus an average of 5-6 times a year, especially in spring, which occurs every 15 to 20 days. Among them, it is not recommended to mate immediately for female cats who have just become adults and are in estrus. They can be mated during the second estrus after the female cat matures.