How to Tell if a Kitten Is Male or Female

To tell if a kitten is male or female, gently lift the tail and look at the area under it: in females the two openings (anus and vulva) are close together and look like an upside-down exclamation mark or a vertical slit, while in males they are farther apart, with a round anus and a small dot-like scrotal area between that and the genital opening. Coat color can offer clues, but a vet check is the surest answer.

Kittens are notoriously hard to sex when they are very young, and many people end up guessing and finding out months later. The good news is that, with a calm kitten, good light and a few simple comparisons, most people can tell the difference with practice. This guide explains how to check safely, what to look for by age, how coat color can hint at sex, common mistakes, when to ask a vet and why it matters for health and spay or neuter timing. To estimate your kitten's age, which helps interpret what you see, use the cat age calculator.

Before you start

• Wash your hands and keep the kitten warm.
• Choose a calm moment, such as after a meal or nap.
• Use good light, such as a bright lamp or window.
• Support the body. Hold the kitten in your lap or on a towel, or have a helper hold it gently.
• Stay gentle and stop if the kitten is distressed.
• For newborns, do this briefly, since the mother may be anxious and the kitten can get cold.

The basic check: look under the tail

1. Place the kitten on its tummy on your lap, or hold it gently with its back toward you.
2. Lift the tail slowly and look at the area just under it.
3. Find the anus, the small round opening right under the tail.
4. Look for the second opening below it.
5. Compare distance and shape.

A handy memory trick: female looks like an "i" (a line below a dot); male looks like a colon ":" (two dots). Many people also say the female's openings look like an upside-down exclamation point, and the male's like a colon.

Checking by age

Newborn to 2 weeks

At this age the genital area is tiny, and the difference is subtle, so look at the distance between the anus and genital opening. In females, the distance is shorter. In males, it is longer. Handle only briefly and keep the kitten warm. It is easy to guess wrong at this stage, so double-check as the kitten grows.

3-8 weeks

The distinction becomes clearer. In males, the scrotum starts to show as two small bumps or a visible patch between the openings. The penile opening is round and set farther below the anus. Females keep the vertical slit close to the anus.

8 weeks and older

By eight weeks, most kittens can be sexed with confidence. Male kittens may show clearer testicles, although these can be hard to see on fluffy kittens or in the first months. At 4-6 months, tomcats typically have more visible testicles, although neutered males will not.

Adult cats

Intact male cats have visible testicles, a round genital opening and a longer distance between openings. Neutered males may have no visible testicles but still have the round opening and longer distance. Females have the same slit shape and closer spacing as kittens.

Coat color clues

Coat color can hint at sex in some cases, because certain color genes are on the X chromosome.

Rare male calico and tortoiseshell cats exist, typically from a chromosomal variation (XXY), and they are usually sterile. Coat color is a hint, not proof, so always confirm with the visual check or a vet.

Behavior and body clues are unreliable

Many people claim males are bigger-headed or more cuddly, or that females are more aloof, but kitten behavior is not a reliable guide. Intact adult males may develop broader cheeks (stud jowls), and unneutered males may spray, but these show up later and do not help with young kittens.

Common mistakes

• Guessing from the dot only. Look at the spacing and shape, not just one opening.
• Checking too early without comparing. If you have a litter, compare kittens side by side.
• Confusing the anus for the genital opening. The anus is the opening closest to the tail.
• Forgetting that fluffy fur hides details. Gently part the fur.
• Assuming a name based on coat color. Orange cats can be female and calicos can very rarely be male.
• Holding the kitten too roughly or too long.

Worked example: comparing two littermates

Two 7 week old kittens, one gray and one orange.

1. Lift each tail in good light.
2. Kitten A: the two openings are close together and look like an "i," with no gap between them. Likely female.
3. Kitten B: the lower opening is a round dot with a small gap and a tiny bump between it and the anus, forming a ":" shape. Likely male.
4. Check against coat color. B is orange, which is consistent with male, though not proof.
5. Confirm at the first vet visit, and use the cat age calculator to plan vaccinations and spay or neuter timing.

When to ask a vet

• You are still unsure after checking and comparing.
• The kitten is a newborn and you need to be certain for feeding or care.
• The genitals look abnormal, swollen or painful.
• Your kitten is straining or crying while urinating.
• You see only one or no testicles in an older male kitten, which can indicate cryptorchidism.
• You suspect a rare condition such as a male calico or tortoiseshell.

Vets can confirm sex quickly during a routine kitten visit.

Why it matters

Knowing your kitten's sex helps with:

• Naming (well, sort of).
• Spay or neuter timing: females are spayed, males neutered, often at about 4-6 months or earlier at some shelters.
• Health planning: male cats are at higher risk of urinary blockage, a serious emergency, while unspayed females face risks of pregnancy and uterine infection.
• Behavior planning: intact males may spray and roam, and females in heat can be loud and restless.
• Introducing pets: pairing intact cats of different sexes can lead to unplanned litters.

Spay and neuter timing

Many vets recommend spaying or neutering at about 4-6 months, and some shelters do it as early as 8 weeks and 2 lb. Kittens can become fertile as early as 4 months, so do not leave males and females together unaltered. Calories needs often drop after surgery, so monitor weight.

When to call your vet

Contact your vet if your kitten strains to urinate, passes little or no urine, cries in the litter box, licks the genital area excessively or has swelling or discharge. A male cat that cannot urinate is an emergency. For general questions about sexing and health, ask at your kitten's first exam.

The bottom line

Lift the tail and compare the openings: close together and slit-like means female, farther apart with a round dot and a bump between means male. Coat color can hint, with calico and tortoiseshell almost always female and orange about three-quarters male, but a vet can confirm it. Plan vaccines and spay or neuter timing with the cat age calculator.