The purpose of newborn screening is to detect potentially fatal or disabling conditions in newborns as early as possible, often before the infant displays any signs or symptoms of a disease or condition. Such early detection allows treatment to begin immediately, which reduces or even eliminates the effects of the condition. Many of the conditions detectable in newborn screening, if left untreated, have serious symptoms and effects, such as lifelong nervous system damage; intellectual, developmental, and physical disabilities; and even death.  I feel that this screening should become mandatory.