At this visit I will offer you the 20 week anatomy ultrasound.
Many important developmental problems can be seen with a scan at this stage. This scan is usually the most detailed examination and includes assessment of the development of the baby and the position of the placenta.
Placenta previa (where the placenta is covering the cervix) can be diagnosed during the anatomy scan, but as the baby develops and the uterus gets bigger, the placenta usually moves away from the cervix. It is usually not possible to know if the placenta has moved far enough for a normal birth until 32 weeks and sometimes even later.
The sonographer usually will explain everything to you as he or she performs the scan. At this scan, you can find out what sex your baby is – although some parents prefer to wait until the baby is born.
Many parents find ultrasound reassuring, but it is important to realise that these scans are a diagnostic procedure. The results they produce may be anxiety provoking – and may require some difficult decisions as well.