I rescued a tom cat that was living outside my place of employment. He looked to be around 4 or 5 months. And in one month, he impregnated 3 of my female cats. One miscarried her 3 kittens, but, she's a kitten herself and the other two females had their babies. My feral female had 2 kittens and my other one had 7 yesterday, two days after the feral had hers. I didn't think he was old enough to make babies yet. Needless to say, he has been fixed , now I have 9 kittens to find homes for.