Answer:
X-rays
Step-by-step explanation:
Having x-rays during pregnancy is highly not recommended because of the type of radiation it emits. Studies show that x-ray cause birth defects. X-rays may also expose a baby to radiation.
During pregnancy exercise helps keep women relaxed, stronger and achieve healthy and recommended weight.
Folic acid is very important for pregnant women because it helps prevent birth defects in children commonly known as neural tube defect.
Ultrasound scan uses sound wave which shows a real picture of inside the body. In pregnancy, ultrasound scan is used in checking progress and also checking pregnancy complications. It is normally non-invasive.