Ultrasounds have a variety of purposes during pregnancy, but the use that often receives the most attention is its ability to reveal the sex of the baby. Some parents-to-be can't wait to find out whether they're having a boy or a girl, while others choose to put off knowing the sex until birth. Either way, a sonogram — the grainy, black-and-white image that results from an ultrasound scan — will be baby's earliest picture and a couple's first chance to see the developing fetus. Ultrasound uses high-frequency sound waves to produce an image on a screen of the baby in the mother's uterus.
Am I Having a Boy or Girl? — Ultrasound & Sex Prediction | Live Science
Most parents today will want to find out the sex of their baby before birth. One of the most common ways to do this is with an ultrasound, most frequently performed at between 18 and 20 weeks of gestation. A prenatal ultrasound is a non-invasive test that uses audible sound waves to produce images of a fetus's shape and position in the uterus. It is a preferred method of imaging during pregnancy as it neither involves radiation nor poses harm to either the fetus or mother. An ultrasound is routinely used at different stages of the pregnancy. While most practitioners will wait until at least six weeks to perform the first ultrasound, the gestational sac may be seen as early as four and a half weeks, while a heartbeat may be detected as early as five.
The million dollar question for many after finding out about a pregnancy: Am I having a boy or a girl? Some people love the suspense of not knowing the sex of their baby until the delivery. Of course, only a doctor can reliably determine the sex of a baby. So if you want to know the sex ahead of time, your doctor can use different tests at different stages of your pregnancy. Some of them carry significant risks.