The appropriate action to be taken by the nurse for a child suffering from a sunken fontanelle should be to check the fluid intake and output of the child.
Sunken fontanelle is the slight curving or depression on the head of a child. The cause of this condition is dehydration. Dehydration can be due to some disease or actual lee intake of fluids by the child. Malnutrition can be another reason for this condition.
Fluid intake is drinking the required amount of water or any other source of healthy fluid daily. Maintaining adequate amount of fluid intake is essential because water is one of the main requirements of the body to carry out all the reactions and remove toxins.