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The second scan offered to all pregnant women is called the anomaly scan, or mid-pregnancy scan, and usually takes place between 18 and 21 weeks of pregnancy.
This scan checks for structural abnormalities (anomalies) in the baby.
Talk to your midwife, GP or obstetrician about any concerns you have.
For many women, ultrasound scans are the highlight of pregnancy.
Ultrasound scans use sound waves to build a picture of the baby in the womb.
The scans are painless, have no known side effects on mothers or babies, and can be carried out at any stage of pregnancy.
This is because most babies are healthy and do not have abnormalities. If a problem is found or suspected, the sonographer may ask for a second opinion from another member of staff.
You might be offered another test to find out for certain if there is a problem.
Most hospitals do not allow children to attend scans as childcare is not usually available.
There are no known risks to the baby or the mother from having an ultrasound scan, but it is important that you consider carefully whether to have the scan or not.
This is because the scan can provide information that may mean you have to make further important decisions.
A black and white picture of the baby will appear on the ultrasound screen.
During the examination, sonographers need to keep the screen in a position that gives them a good view of the baby.
The dating scan and anomaly scan are offered to all women, but you don't have to accept them.