Southampton dating scan
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Finding out about having twins early in pregnancy also gives you more time to prepare for the birth and for your doctor and midwife to plan your care. Nearly all scans after 10 weeks can be done through your tummy, and most units ask you to arrive with a full bladder.
The sonographer will put some gel on your tummy and move a small hand-held device (transducer) over your skin to get views of your baby.
You may need to have a full bladder for this scan, as this makes the ultrasound image clearer.
Your midwife or doctor will book you a dating scan appointment.
Your baby's head, limbs, hands, and feet can be seen, as well as his abdominal wall and some organs, such as his stomach.
The dating scan isn't designed to look for more subtle abnormalities, though.
That will happen at your next routine scan at about 20 weeks However, some major problems can be seen at your dating scan, such as issues with the umbilical cord or with your baby's skull or abdominal wall.
You may need a second scan to check the first scan's findings.