![]() ![]() ![]() A 2016 study looked at the accuracy of such tests. This is sometimes called “nub theory.” Using this method, the sonographer looks at whether the tubercle is pointing up toward the baby’s head, which indicates a boy, or whether it remains flat or points down, indicating a girl. At 12 weeks, we may be able to use ultrasound to determine gender based on the angle of the genital tubercle. So how can we predict gender before then? Blood tests to screen for certain conditions can tell us gender after nine weeks. However, it’s not until 14 or 15 weeks that you can clearly begin to see the differentiated genitalia. ![]() It’s at that point that the genital tubercle begins to develop into a penis or clitoris. Boys’ and girls’ genitals develop along the same path with no outward sign of gender until about nine weeks. However, we could clearly see during the 20-week ultrasound that my daughter was most certainly not a boy! Your baby’s gender is determined at the moment of conception – when the sperm contributed a Y chromosome, which creates a boy, or an X chromosome, which creates a girl. I was told I likely was having a boy during an ultrasound to screen for Down syndrome at about 12 weeks. Tiffany’s not the only woman to whom this has happened. How babies’ genitalia develop and ‘nub theory’ But take it from us - it’s just a prediction, and things might change! It’s fun to find out whether you might be having a boy or girl early in your pregnancy. We reminded them that we said we were 90 percent sure, not 100 percent sure! We had a gender reveal party soon after, and our parents thought we had played a joke on them. It was such a special moment for the two of us. The sonographer walked us photo-by-photo through the anatomy and we got to see our little boy move around. The sonographer responded, “Well, something has changed. My husband said, “I’m pretty sure nothing has changed, so it’s a girl.” The sonographer asked if we wanted to guess what we were having. We went to the 20-week ultrasound pretty confident we’d soon be buying pink clothes. My Pinterest board was very girly! We also picked out about 20 girls names – and five boys names just in case. And while we refrained from buying anything, we were definitely thinking pink. The MFM said while ultrasound was 90 percent accurate in predicting gender at 12 weeks, and she and the sonographer were fairly confident in their prediction, we should wait until our 20-week anatomy ultrasound to be sure.We told our parents we were having a girl, but we warned them against buying anything until the next ultrasound. However, we didn’t rush out to buy pink clothes and paint for the nursery. We were thrilled at that time to be told we were having a girl. They told me if I waited to have the tests done at 12 weeks, they may be able to determine the gender through ultrasound. I turned 35 this year, and my Ob/Gyn referred me to a maternal-fetal medicine (MFM) specialist for some extra tests because of my age. We wanted to pick colors, decorate the nursery, and buy clothes before our little one arrived. 2, 2017, we knew we wanted to find out the gender. So when we found out we were expecting our first child on Jan. I’ll let Tiffany tell her story, and then we’ll talk about how babies’ genitalia develop, how we may be able to predict a baby’s gender and when, and why you shouldn’t expect to learn your baby’s gender early. Even medical tests that predict gender aren’t always right – and this is especially true in early pregnancy, as McKinney, Texas, resident Tiffany Donnell found out. While gender prediction tests may be fun, they certainly aren’t scientifically proven. If you develop acne or other skin problems, you’re having a girl. ![]() Can’t put down the salty and sour foods? It’s a boy. If it swings in a circle, it’s a boy if it swings back and forth, it’s a girl. Tie a ring to a piece of string and hang it over your belly.There’s no shortage of old wives’ tales for how to predict a baby’s gender. ![]()
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