Poisons can be both obvious and not so obvious. If you have children, any medication, even aspirin, can be dangerous to children. Iron and iron supplements are a leading cause of death for children under six.
Lead poisoning occurs over time and is another serious hazard.
Lead may exist either in the paint on your walls, in household products, ceramic vases and pottery, and even in old toys. They're sleepy before their naptime. Their eyes go around in circles. There are burns around the lips of mouth. There are stains of the substance around the child's mouth, or there is an unusual smell on a child's breath.