At what age do cats go into heat?

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The heat can hit as early as 4 months.
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The age a cat reaches puberty will vary from kitten to kitten, just as with humans; and much depends on factors such as environment and breed. Outdoor or feral kittens may reach maturity earlier, especially if intact male cats are around. Siamese cats can show signs of puberty as soon as 4 months of age, while other breeds may not reach sexual maturity until they're 10 months old. In general, by 5 to 6 months of age, cats have reached adolescence. Female kittens can then go into heat and become pregnant even though they're little more than kittens themselves. Cats being bred intentionally shouldn't be permitted to get pregnant until they're at least a year old, so they can develop the instincts and emotions to cope with motherhood.

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