When Do Cats Go Into Heat For The First Time. Estrus is the time when the cat can become pregnant. Some kittens go into heat as early as 4 months, while longhaired cats may not have a first heat until about 18 months, though that is less common.
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Once she is mounted (supposedly even if penetration does not occur), she will ovulate & go out of heat and can be easily spayed. They did that for a couple of days & then she went out of heat & i got her spayed right away. Heat, oestrus, and estrus all refer to heat cycles in cats.
