<prompt> False regarding thumb sucking is:Must be treated vigorously in the first year of lifeIt is a sign of insecurityIt is a source of pleasureCan lead to malocclusion  <response>: Ans. A. Must be treated vigorously in the first year of lifeThumb sucking is normal in early infancy. It is a source of pleasure in children and is a sign of insecurity. It can lead to malocclusion of teeth, if it persists beyond 5 years. Best policy is to ignore thumb sucking and concentrate on positive aspects of childs behavior. No treatment is required below 5 year of age. 