What is a child's lips cracked?

Children's lips chapped, this situation may be caused by dry climate, may also be caused by the child's body fire caused by chapped lips, but also may be caused by the lack of vitamins (A, B2) in children's lips chapped. If the climate is dry, in this case can give children in the lips coated with some edible vegetable oil or honey. If the body fire caused, can give the child to drink some mung bean soup under the fire. If vitamin (A, B2 caused, in this case can give children to eat carrots, mushrooms, animal liver and other foods rich in vitamins (A, B2.