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If you have a prenatal blood test (NIPT), you may be able to find out your baby's sex as early as 11 weeks of pregnancy. Ultrasounds may reveal sex organs by 14 weeks, but they aren't considered fully accurate until 18 weeks. If you have CVS at 10 weeks, the results will reveal your baby's sex by 12 weeks. If you have an amnio at 16 weeks, you can find out by 18 weeks. With IVF, you can find out the sex before you even transfer the embryos.
When can I find out my baby's sex with a blood test?
You can find out your baby's sex if you have noninvasive prenatal testing (NIPT), a blood test that can detect Down syndrome and a few other chromosomal conditions starting at 10 weeks of pregnancy. (It takes a week or two to get the results.) It also looks for pieces of the male sex chromosome in your blood, which can be used to determine whether you're carrying a boy or a girl. This test is intended for women at higher risk of having a baby with chromosomal disorders but is often available to women at lower risk as well. Discuss with your provider whether the test is appropriate for you.
Note: Some early gender DNA tests you can do at home claim to deliver accurate results as early as 8 weeks. But with no independent studies to back up those claims, you may be better off relying on standard tests to find out your baby's sex. More on these below.
When can I find out my baby's sex by ultrasound?
Many pregnant women find out their baby's sex (if they choose to know) during their midpregnancy ultrasound, which is usually done between 18 and 22 weeks. However, if the technician can't get a clear view of the baby's genitals, it may not be possible to tell for sure.
Although a baby's penis or vulva begins forming as early as 6 weeks, boy and girl babies look very similar on ultrasound until about 14 weeks, and it can still be hard to tell them apart for several weeks after that. By 18 weeks, an ultrasound technician will most likely be able to identify the sex – if the baby is in a position that allows the genitals to be seen. Otherwise, you may be able to find out if you have another ultrasound later in your pregnancy.
When can I find out my baby's sex with CVS or amnio?
Other women find out their baby's sex from a genetic test like chorionic villus sampling (CVS) or amniocentesis. These tests are usually done to determine whether a baby has a genetic disorder or a chromosomal abnormality, like Down syndrome. CVS is usually done between 10 and 13 weeks, and amniocentesis between 16 and 20 weeks. You have to wait for 2 weeks for the results from both tests. Women who are not at increased risk of genetic and chromosomal problems don't typically have CVS or amnio, in part because these tests are invasive and carry a small risk of miscarriage.
Can I find out my baby's sex during IVF?
If you have preimplantation genetic testing during in vitro fertilization (IVF), your embryos are tested for genetic or chromosomal abnormalities and sex. Preimplantation genetic testing is almost 100 percent accurate in determining the sex of the embryos. But if you have embryos of both sexes placed in your uterus, you won't know which one(s) implant.
Do gender predictor tests work?
There's no shortage of methods for predicting a baby's sex at home, but these methods lack scientific proof. For example, the Ramzi theory is not recognized by professional medical organizations (including the American College of Obstetricians and Gynecologists) as a reliable predictor. Most gender predictor tests are clearly just for fun and offer only a 50/50 chance of being accurate – the same as guessing.
At-home gender kits (available mostly online) test blood or urine to predict your baby's sex, but there's no scientific evidence that these tests really work.
SneakPeek, for example, tests a blood sample and claims to be 99 percent accurate as early as 8 weeks, but no independent studies support this claim. IntelliGender is an at-home kit that tests urine to predict your baby's sex, but the company doesn't claim any particular accuracy rate. It also recommends against making decisions based on the test results, emphasizing that it's really just for fun.