OK, here are some examples. First, my soon to be born little boy at 12 weeks. I’ve put a red arrow in pointing to his ‘nub’, which as you can see is pointing ‘up’. Some male foetus shots I’ve seen have been pointing almost straight up.
Nub theory: How to predict your baby’s gender from the 12 week scan
Here is a shot of a girl. You can see her nub is pretty much horizontal. You can also see that her nub looks forked at the end. Some people think this means it is more likely that it is a girl, but a fork can be seen in both genders.
If you get your scan at 11 weeks, it can be difficult to tell the difference between the genders. A scan at 12 weeks is around 75% accurate and at 13 weeks it’s closer to 95% accurate.
When you go in for your scan, ask your sonographer to get a shot exactly like one of the ones above- the foetus right side on, back flat not curled up and a good shot of the ‘nub’.
There is loads of information online about the nub theory. This site has photographs showing the differences between the genitals and includes examples of ultrasound images.
If you’ve already had your scan and the nub is visible, but you can’t work out if it’s a boy or a girl, why not go to the In Gender Forum where you can post up your scan on the boards and get members to have a look and make their predictions. There are also threads on which members post up their scans AFTER the gender has been confirmed either at the 20 week scan or at birth.