The primary clinical manifestation of scabies is:

Choice A reason: This statement is incorrect, as burping the infant after feeding is not a nursing intervention, but a normal practice to prevent gas and discomfort. The nurse should encourage the mother to burp the infant gently after each feeding, and to avoid overfeeding or underfeeding the infant.

Choice B reason: This statement is incorrect, as giving five milliliters of water is not a nursing intervention, but a harmless amount of fluid for the infant. The nurse should inform the mother that water is not necessary for the infant, as breast milk or formula provides enough hydration and nutrition. However, the nurse should also reassure the mother that a small amount of water will not harm the infant.

Choice C reason: This statement is incorrect, as wrapping the infant during feeding is not a nursing intervention, but a comforting measure for the infant. The nurse should support the mother's bonding with the infant, and suggest ways to make the feeding experience more pleasant and relaxing for both of them. The nurse should also monitor the infant's temperature and avoid overheating.

Choice D reason: This statement is correct, as giving thirty milliliters of water is a nursing intervention that indicates a need for further education and guidance. The nurse should explain to the mother that giving too much water to the infant can cause water intoxication, which can lead to hyponatremia, seizures, or even death. The nurse should also teach the mother the signs and symptoms of water intoxication, such as irritability, lethargy, vomiting, or swelling.

Choice A reason: This is incorrect because breastmilk does contain some iron, although not as much as formula. However, the iron in breastmilk is more bioavailable and easily absorbed by the infant. Therefore, iron drops are not necessary for exclusively breast-fed infants until they are 4 to 6 months old.

Choice B reason: This is incorrect because the iron levels of breast-fed infants will start to decline after 4 to 6 months of age, as their iron stores from the mother are used up. Therefore, they will need iron supplementation from other sources, such as iron-fortified cereals or drops.

Choice C reason: This is correct because the iron stores of breast-fed infants are sufficient for the first 4 to 6 months of life, but then they will need additional iron from other sources. Iron supplementation can prevent or treat iron deficiency anemia, which can affect the infant's growth and development.

Choice D reason: This is incorrect because solids are not recommended for infants younger than 4 months of age, as their digestive system is not mature enough to handle them. Solids can also interfere with the intake of breastmilk, which is the main source of nutrition for infants. Iron-rich foods can be introduced after 6 months of age, along with continued breast-feeding.