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A cat's pregnancy typically lasts 65 days, though it can take as few as 63 or as many as 71 days in some cases, according to WebMD. During her pregnancy, your little girl becomes more docile than usual, and she won't go into heat.
Your question was: How long from giving birth to a litter of kittens can the mother cat become pregnant again? The answer is â cats can get pregnant again immediately. Domestic cats usually reach sexual maturity (puberty) between five to 12 months, at which time they experience their first estrus.