Gender is determined at 13 weeks, if baby is in good position. If you wish to know the sex of your baby, we will do our utmost to find out. Sometimes, it is not possible to tell the sex immediately - (i.e. If baby has its legs crossed or is in an awkward position). On these occasions, we will ask you to take a break, have a short walk, some water, and then we will try again. Usually, this does the trick. However, if that doesn't work, we will offer you a rescan, at no charge. We will make an appointment a few days later in the hopes that baby has moved around. Please note that it is very rare for us to have to do this since our sonographers are all very experienced. We always take the time to point out and explain what you are looking at on the screen.