Although often all three forms of parental safety behaviour are necessary, safety measures should be taken whenever possible. This is because, first of all, safety measures may remove sources of accidents ['single action' safety measures (e.g. applying a topguard on the cooker) have this quality even more than safety measures that require frequency actions injuries sustained, e.g. bike-helmets and protection material for sharp table corners. First aid is, of course, the last action for parents to limit injury or even to prevent the child's death (e.g. mouth-to-mouth resuscitation).