For children who have little strength to move their arms due to muscular dystrophy, muscular atrophy or arthrogryposis, the Wilmington Robotic Exoskeleton (WREX) is an orthosis to assist in arm movements. The device has been used for children as young as six years old. However, in the case of two-year-old Emma Lavelle, the makers of WREX had to develop an even smaller version of the device. Using 3D printing technology, the team that developed WREX printed custom parts for a smaller and lighter exoskeleton to fit their youngest patients. To date, a total of 15 children have received custom 3D-printed exoskeletons.