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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. It won't hurt, although you may feel a little pressure on your tummy. If your womb (uterus) is very deep in your pelvis, or if you're overweight, you may be offered a vaginal scan, which can get a closer view of your baby. It shouldn't be uncomfortable, and you don't need a full bladder Your sonographer will give you a report of the scan, which will tell you exactly how many weeks pregnant you are.
How big your baby will be depends on when you have the scan: After 13 weeks, your baby can curl up and stretch out, so measuring the length becomes less accurate.
The scan can check that your baby's heart is beating nicely and that he's developing normally.
Your baby's head, limbs, hands, and feet can be seen, as well as his abdominal wall and some organs, such as his stomach.
You may need a second scan to check the first scan's findings.
The dating scan will also show if you're expecting twins, triplets, or more.