Alison is pregnant with a baby boy. What type of examination is MOST likely revealed the sex of the baby?

The examination most likely to reveal the sex of a baby is an ultrasound. Typically, an anatomy scan ultrasound performed around the 18-20 weeks of pregnancy can determine the baby's sex, as the genitalia are usually developed enough to be seen at that point. In some cases, non-invasive prenatal testing (NIPT) can also provide information about the baby's sex through a blood test taken from the mother as early as the 10th week of pregnancy.