regarding pregnancy control of cats

Question
I WOULD BE GREATFUL TO U IF U COULD ANSWER THIS QUESTION TO ME.
I HAVE TWO FEMALE CATS. ME AND MY FAMILY LOVE THEM VERY MUCH,BUT THE PROBLEM WE FACE IS THAT OF THESE CATS GIVING BIRTH TO  KITTENS EVERY THREE MONTHS. THIS HAS BECOME A BIG PROBLEM AS THESE KITTENS KEEP LITTERING ALL AROUND THE HOUSE. I WANTED TO ASK U WHETHER THER IS ANY BIRTH CONTROL PILLS FOR CATS ,IF YES RECOMMEND SOME .

THANK YOU

Answer
there are birth control pills for cats available in some countries, but not in the u.s. and the findings are that long term use of them causes uterus cancer. if you can catch the cats take them to the vet to be spayed. thats the best, and cheapest in the long run, proven method of birth control for animals.