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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.
Physically many cats are able to get pregnant as young as only six or seven months old. However, it is better and healthier for pregnancy to occur when they're a little older. Often younger cats are not good mothers; the maternal instinct seems to be better developed when they're one year or older.