The earliest time we can assess the babys sex is at 12 weeks gestation/pregnancy: We can tell the sex of the baby at the 12 week scan by assessing the direction of the nub. This is something that can be identified on babies at this stage and if it points vertically then it is likely to be a boy.

How accurate is gender at 12 week scan?

The accuracy obtained on the 12th week of pregnancy was 90.5% (67/74) in the present study if counting only the cases where the gender has been assigned; however, if also taking into account the cases, in which the fetal gender has not been assigned, the accuracy is 67.7% (67/99), which is comparable to the accuracies

How accurate is nub theory at 12 weeks?

Tested with 656 patients, Nub Theory was able to determine babys sex 96 percent of the time when used between 12 weeks 4 days and 12 weeks 6 days (and 97 percent of the time when used between 13 weeks and 13 weeks 6 days). It accurately identified males 99 to 100 percent of the time.

Can you tell baby gender at 13 week scan?

The accuracy of determining your babys gender increases with how far along you are in the pregnancy. The accuracy can vary from 70.3% at 11 weeks to 98.7% at 12 weeks, and 100% at 13 weeks. Eleven weeks is the earliest that sex determination can be carried out with an ultrasound using a method called the nub theory.

Can you see a nub at 12 weeks?

All babies have a genital tubercle or nub between their legs that develops between 11-13 weeks. According to this theory, the angle of the nub will indicate whether a baby is a boy or girl. Its said that if the nub is over 30 degrees up from the spine, its a boy. However, if its under that, then its a girl.