At what point in a pregnancy do the sex organs form?

I know that the chromosomes determine the baby's sex at conception but at what point do the sex organs actually start to form?

?2010-04-07T17:10:39Z

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they start forming around 15 weeks, however they cannot be clearly seen on ultrasound untill around 20 weeks. befoer that all babys look like girls.

~*RJ was born July 12*~i2010-04-07T17:09:23Z

around week 10 or so, then finish up by week 22. you can start to tell a big difference between them at about 14 weeks.