Years ago, a scientist diagnosed that shaking a young baby vigorously can cause bleeding inside the head and increase pressure on the brain. Because a baby's muscles are not fully developed and brain tissue is exceptionally fragile, shaking a baby for only a few seconds can injure such baby for life. Such injuries can include brain swelling, mental retardation, development delays, hearing loss, blindness, paralysis and death. In many cases however, the injuries are not immediately visible and the baby may be diagnosed as, having cold or viral illness! So, never shake a baby please!