Lift the tail gently and look at the two openings under it
Male kittens usually have a larger gap between the anus and genital opening
Male kittens usually have a round genital opening
Female kittens usually have a smaller gap between the anus and genital opening
Female kittens usually have a vertical slit-shaped genital opening
Male kittens may have a slight bulge between the openings as they grow
Female kittens usually have a more compact, close-together appearance
Compare with a clear reference photo if needed
When unsure, ask a veterinarian or shelter staff to confirm