J.T.
"The gender for a boy or girl is fully develpoed after 20 weeks all fetuses are boy gender till then."
Okay, I had to quote that from another poster... so, you truly think that before 20 weeks, they all have XY chromosomes and it magically turns to XX at 20 weeks for a girl? I hate to tell you, that is not even almost the case. 20 weeks is generally considered the benchmark for easily identifying the gender - but they are not all male before then! all 3 of my children were predicted(accurately) by my high risk OB at around 12 weeks. he did say that b/c of the small size of the babies, he would be more confident in his "guessing" later - but he was right with all three of mine :)