How to Determine a Kitten's Sex: A Step-by-Step Guide

Determining the sex of a kitten can be exceptionally challenging – especially before about six to eight weeks of age. With a bit of practice, you’ll be able to determine if your kitten is a 'he' or a 'she.'

Anatomy Basics

The first step in sexing kittens is remembering the differences between male and female genitalia. Although it may look similar in young kittens, the parts are quite different. Male kittens have testicles, which typically have descended into the scrotum at the time of birth. A male cat’s penis is enclosed in the prepuce and is situated just below the scrotum. Female kittens have visible vulvas. As with all mammals, both male and female kittens have nipples and an anus. While not part of the genitalia, the anus is an important landmark in determining a kitten’s sex. The anus is a circular structure located just underneath the base of the tail.

Handling Kittens

Remember to handle kittens gently at all times, as they are fairly delicate at young ages. Even though you’ll need to take a look under their tails, be sure not to lift them by the tail, as this can cause spinal injuries. It’s best to simply lift the tail while a kitten lays on a flat surface or hold them on their back, while supporting their head and neck.

Finding the Differences

There are two main differences to keep an eye on while determining a kitten’s sex. The first is commonly referred to as the “anogenital distance,” which means the distance between the anus and the genitals. The distance between a female’s vulva and anus is much smaller than that between a male’s penis and anus. The tricky part is not confusing a male kitten’s scrotum for other genitalia.

The second main difference is the shape of the genitalia. A female’s vulva is shaped as a vertical slit or small oval, whereas a male’s prepuce (the skin surrounding the penis) is a circular or dot-like shape. The testicles are typically descended into scrotum at birth, but can be extremely difficult to actually feel until a kitten is between 10 to 12 weeks of age, as they are very tiny.

Male vs. Female Kitten: Side-by-Side Anatomy Comparison

Use this quick-reference table when you're ready to gently examine your kitten. Keep in mind that differences are subtle before six to eight weeks of age, so take your time and handle your kitten with care.

Quick visual tip: Think of punctuation. A female kitten's anatomy resembles a lowercase i (dot over a line), while a male kitten's resembles a colon : (two dots — the prepuce opening above and the scrotum below). This simple trick can help you tell them apart at a glance.

When in doubt, ask your veterinarian. If you're unsure after examining your kitten, your vet can confirm the sex quickly and safely during your kitten's first wellness visit — and it's always a good reason to schedule that appointment early. [www.avma.org/resources-tools/pet-owners]

Frequently Asked Questions

At what age can you reliably tell a kitten's sex? Sexing kittens becomes noticeably easier around six to eight weeks of age, when the anogenital distance and genital shape are more distinct. Before that window, even experienced pet parents and veterinary professionals can find it genuinely difficult to make a confident determination. If your kitten is younger than six weeks, your veterinarian can help confirm the sex during a routine wellness visit.

Why is it so hard to tell young kittens apart by sex? In very young kittens, the genitalia are small, underdeveloped and look surprisingly similar between males and females. The testicles, though typically descended into the scrotum at birth, are so tiny that they are nearly impossible to feel until a kitten reaches 10 to 12 weeks of age. The anogenital distance — the key visual clue — is also much shorter in newborns, making the difference between male and female less obvious at a glance.

What exactly should I be looking for when I check? Gently lift the kitten's tail while he or she rests on a flat, supported surface. Look for two things: the distance between the anus and the genitals (males have a noticeably larger gap) and the shape of the genital opening (a vertical slit or small oval indicates a female; a small, circular dot-like opening indicates a male). Never lift a kitten by the tail, as this can cause serious spinal injury.

What if I still can't tell after checking? That is completely normal, especially with very young kittens. If you are unsure after a careful, gentle examination, schedule a visit with your veterinarian. A veterinary professional can confirm your kitten's sex quickly and safely, and the appointment is also a great opportunity to discuss a wellness plan, vaccinations and spay or neuter timing. https://www.avma.org/resources-tools/pet-owners

Does coat color give any clues about a kitten's sex? In some cases, yes. Calico and tortoiseshell coat patterns — those with a mix of orange, black and white — occur almost exclusively in female cats, because the genes responsible for those color combinations are carried on the X chromosome, and females have two X chromosomes. Orange (ginger) cats, on the other hand, are more commonly male. That said, coat color is never a substitute for a proper physical examination, and exceptions do exist.

When should a kitten be spayed or neutered? The American Veterinary Medical Association supports early spay and neuter, and many veterinarians recommend the procedure at around five to six months of age, though your veterinarian will advise the timing that is right for your individual kitten based on his or her health and development. Getting your kitten spayed or neutered helps prevent unwanted litters and can support long-term wellbeing. https://www.avma.org/resources-tools/pet-owners

This article was created with assistance from AI tools and reviewed for accuracy by Petco's content team.