How To Tell If A 5 Week Old Kitten Is Male Or Female?

My friend has a cat that is 5 weeks old. She wants to know if the kittens are male or female. It is hard to tell it looks like one, but I think its female.

http://answers.yahoo.com//question/index?qid=20070623191343AA3VXlR

Where do you find info on my “2 year old” dog?