But if your baby's lying in an awkward position, it's not always easy to tell.
Plus, some hospitals have a policy of not revealing the gender of a baby.
A first-trimester scan will check that your baby's heart is beating and also look at the basic anatomy of your baby’s head, abdominal wall, and limbs.
Ultrasound scans have been used in pregnancy for decades, and nobody has found them to be harmful if carried out correctly.
A full bladder helps the ultrasound echoes to reach your womb, giving the sonographer a good view of your baby.
If your baby's still deep in your pelvis, or if you're overweight, the image won't be very clear.
You can also help your toddler to think independently by offering her simple choices.
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An ultrasound scan sends sound waves through your womb (uterus). The echoes are then turned into an image on a screen that shows your baby’s position and movements.
Hard tissues, such as bone, reflect the most sound waves and so make the biggest echoes.
This is a valuable part of your toddler's development, and helps her to understand how she can have different relationships with different people.
Varied relationships with close family and friends help her to build her sense of self.