Usually between 16-20weeks. But a girl i used to work with didn't find out untill she was almost 30weeks! The baby wouldn't stay still long enough to tell or opened the legs up! So you never really kno!
Technically it's genderless right now. The genitalia is formed between 7-8 weeks. But it's too small to see right now. Usually an ultrasound will be done at around 20 weeks. You should be able tosee something then.
at 7:32 PM on Jul. 16, 2008
16-20 weeks. Closer to 20 weeks is better for accuracy purposes.