The Highs and Lows of Air Pressure Air near the surface flows down and away in a high pressure system (left) and air flows up and together at a low pressure system (right). Credit: NESTA
A female cat can get pregnant when sheâs as young as 4 months old, unless sheâs been spayed to prevent that. Queens can keep going into heat every 2 to 3 weeks from the spring through the early fall, making them ready to reproduce more often than not. A catâs pregnancy lasts about 63-65 days.
Other Factors. Age, nutrition and health of the mother also influence litter size. Cats are most fertile between 2 and 8 years old. Younger and first-time moms tend to have smaller litters than a 4- or 5-year-old cat. If not in optimal health, spontaneous abortion may occur, leading to smaller litters.