Slide show: Fetal ultrasound
Image of a fetal ultrasound slide showing baby's head
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This is a view of a baby's head. The thick white lines that form a circle near the top of the image indicate the baby's skull. The white line in the middle of the circle is the midline structure that separates the baby's brain into symmetrical halves.

Measurements of your baby's head can help your health care provider determine your baby's age.

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