The ultrasound machine looks like a large computer on wheels. A transducer, a small hand-held instrument, is attached to the machine.
The technologist will put a warm lotion on the transducer and also on the part of your child's body that is going to have the ultrasound. The lotion is clear, easily removable with water and does not stain clothing.
The technologist will glide the transducer over the parts of the body that the doctor needs to see.