Answer
Janet's concerns are unwarranted. Ellen is getting a fetal sonogram which does not cause any birth defects in the unborn child.
Work Step by Step
Janet's concerns about exposing a fetus to X-rays is warranted. X-rays can cause genetic mutations that can lead to not only cancer but also birth defects.
However, Ellen is not getting an X-ray done; she is getting a sonogram done. Sonography uses ultrasound waves, not X-rays. The ultrasound waves are harmless to a fetus. In fact, sonorgraphy is the imaging method of choice for obstetrics due to its safety, inexpensiveness, and portability.
