This device is used to immobilize young children in order to get their x-rays, when a child is very sick and an x-ray is needed to diagnose them. It does NOT hurt them at all. Taking multiple images of a moving baby, in order to get the least blurry one is more harmful because then the child is exposed to radiation for a longer period of time.
Pigg-O-Stat, allows for a technologist to grab chest images of a child as fast and as efficiently as possible. The children may sometimes cry, and get frustrated but only because they are not familiar with this device. This is typically used for babies under 11 kg or around 2 years old.