Most babies are able to begin sitting up when they reach the age of 4 months. However, some of them might need more time and start sitting independently when they become 7 months old. Until this time, the baby would definitely have learned how to roll and would be able to hold his head up too.
UV radiation, in the form of lasers, lamps, or a combination of these devices and topical medications that increase UV sensitivity, are sometimes used to treat patients with certain diseases who have not responded to other methods of therapy.
Gamma rays. Because of their great penetrating abilities, these can be used to for medical purposes like: - killing cancer cells-forming an image (take a picture) of the internal structures of someones body (who has been injected with a gamma ray fluid).