 The gestation period for cats is between 64 and 67 days , with an average of 66 days . The size of a litter usually is three to five kittens , with the first litter usually smaller than subsequent litters . Kittens are weaned between six and seven weeks old , and cats normally reach sexual maturity at 5 – 10 months ( females ) and to 5 – 7 months ( males ) , although this can vary depending on breed . Females can have two to three litters per year , so may produce up to 150 kittens in their breeding span of around ten years . 
