This video shows a baby being squeezed in a clear tube to keep her still - to get X-rays done. Six-month-old Stevie is then X-rayed, with her arms up high in the clear cylinder. Stevie has Down's Syndrome and a congenital heart defect, so she is no stranger to X-rays.
The Tube is actually a pediatric X-ray machine—with the unfortunate name of Pigg-O-Stat—and apparently, this thing is the go-to option medical professionals use to X-ray small children.