While some parents like to wait until delivery to find out whether they are having a boy or a girl, others want to know as soon as possible. For those who just can’t wait, this appointment can be an exciting one. Ultrasounds can determine the sex of a baby as early as 14 weeks, but the 20-week anatomy scan is a common time for the parents-to-be to find out, if they choose to do so. For those with less patience, noninvasive prenatal testing is available at the 10-week mark, which uses a blood test to determine the baby’s sex, among other things.