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The BabyCenter Editorial Team. Most pregnant women find out their baby's sex (if they choose to know) during their mid-pregnancy ultrasound, usually between 16 and 20 weeks. However, the technician may not be able to tell for sure if she can't get a clear view of the baby's genitals.
Tests. 1  Get an ultra-sound. 2  Undergoing amniocentesis, which is sometimes done on pregnant women who are 35 years old or older, can reveal the gender. 3  Have the CVS or chorionic villus sampling test done, which is performed during the first trimester of pregnancy and can determine if there are problems with the baby's chromosomes. This test will reveal the baby's gender. Keep in mind that CVS or amniocentesis are not generally done simply to determine a baby's sex.