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Just got a kitten, how do I tell its age and determine its sex?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Female | unspayed

So I got a kitten and we don't know her age. I'd like to know if there's a way to know the age and at what age can I know their sexe. Thanks in advance!

1 Answer

Most Helpful Answer

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Answered By Angel Alvarado, LVT

Licensed Veterinary Technician

Published on November 15th, 2018

The general rule of thumb is about 1 month of age for each pound of weight. This is not accurate in all cases though. Baby teeth, incisors and canines (fangs), erupt at about 3-4 weeks of age. If Lucy has all her baby teeth, she is at least 6 weeks old. You should be able to determine sex right away. This is how: Lift the tail. Right under the tail is the anus. Below that is another opening which is round in males and a vertical slit in females. Also, the distance between the anus and genital opening is greater in males. A physical exam by your vet can confirm gender. You can also post a clear picture of the back end in a new question and we can let you know.

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