An ultrasound sometimes also called a sonogram is a diagnostic test that uses sound waves to create a visual image of uterus, baby, and placenta, and allows 4d ultrasound technician to gather valuable information about the progress of your pregnancy and your baby's health. During the exam, the sonographer or ultrasound technician transmits high-frequency sound waves through your uterus that bounce off your baby. A computer then translates the echoing sounds into video images that reveal your babys shape, position, and movements.

If you're having a low-risk pregnancy, however, you might not be offered an ultrasound at all. In fact, the American College of Obstetricians and Gynecologists recommends ultrasound only when there's a specific medical reason. According to the March of Dimes, about 70 percent of pregnant women in the United States have an ultrasound.

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