In one study , fetal gender was correctly predicted by fetal DNA from maternal plasma samples taken between 10 and 13 weeks with 100% sensitivity. As the identification of male fetal DNA sequences is relatively easy, one potential application is the non-invasive identification of male fetuses at risk for an X-linked condition. Fetal sexing in early pregnancy therefore could be the first step to identify fetuses that are at risk and would require invasive testing for confirmation of the diagnosis  or in cases where the fetal sex affects clinical management such as in the use of corticosteroid therapy for congenital adrenal hyperplasia in those carrying female but not male fetuses .
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The first trimester is very important for the mother and the baby. For most women it is common to find out about their pregnancy after they have missed their menstrual cycle. Since, not all women note their menstrual cycle and dates of intercourse, it may cause slight confusion about the exact date of conception. That is why most women find out that they are pregnant only after one month of pregnancy.