Here's why:
* Tiny Size: Kittens are incredibly small at one day old, making it difficult to distinguish their anatomy.
* Lack of Developed Genitals: The external genitalia are still developing and very small.
* Similar Appearance: Male and female kittens often look identical at this age.
How to Determine Sex Later:
* Around 3-4 weeks old: You might be able to start seeing a difference. Look for a small, round opening (the vulva) for females, and a slightly more prominent bulge (the scrotum) for males.
* Vet Check: Your veterinarian can accurately sex your kitten through a physical exam, especially as they develop.
Remember: It's best to wait until your kittens are a bit older for accurate sex determination. Don't try to force open their genitals or handle them roughly, as this can cause harm.