Unneutered female cats usually come into their first heat between 4 and 12 months of age. This is when they can get pregnant.
What to expect in your kitten's first year
When Do Cats Go Into Heat?
What to do when your Cat is in Heat
Calculating Cat Age
The Importance of Your Savannah Kitten's First Year at Home With You
Kitten Vaccines Kitten Vaccines
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IAMS Cat Age Chart & Calculator
How Many Litters Can a Cat Birth in One Year?