The most common way to find out whether you're having a girl or a boy is at your 20-week ultrasound scan (anomaly scan). This is usually offered between 18 and 21 weeks of pregnancy. Sometimes, however, it's not possible to find out the sex at the anomaly scan.

Can anomaly scan tell wrong gender?

If it becomes clear to the Sonographer during the course of the scan then they will tell you the baby's sex. Studies have shown that scans to determine the sex of the baby can be wrong 1-3% of the time so you must accept there is a small possibility of being told the wrong sex.

How can you tell on an ultrasound if its a boy or girl?

If you want to know whether you're having a boy or a girl, your best shot is usually the mid-pregnancy ultrasound between 16 and 20 weeks. At that point, your baby's genitals are developed enough for the sonographer to see – unless your baby is hiding them.