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Hello, my name is***** and I'm happy to help answer your question. It can be very challenging to tell the sex of a kitten, especially when they are very young, but at 8 weeks old we should be able to tell. Let me find you some pictures- give me one minute.
Attached is an image that can help in determining the sex of a kitten. Basically we look for the shape of the genital opening and the distance from the anus. In males, the opening tends to be circular and there is generally a fair distance between the anus and the genitalia. In females, the opening tends to be more slit-like and is located closer to the anus.
If you want to take a picture like that one of your kitten, I can try to determine the sex for you :)