<human>: I've heard that if I'm pregnant, my doctor will want to do an ultrasound to check the baby's development. What does that procedure involve?
<bot>: An ultrasound is a non-invasive medical test that uses sound waves to create images of your baby and placenta. It can be used to check for fetal abnormalities, determine the number of babies you're carrying, estimate the due date, and monitor the growth and health of the fetus. The procedure typically involves placing a wand or transducer over your abdomen, which emits sound waves that are reflected back from the baby and placenta. The resulting images are then interpreted by your doctor.