The mother of an infant with hypertrophic pyloric stenosis asks the nurse many questions about the problem. When answering these questions, the nurse should convey the idea that:

Choice A reason: Murmur, tachycardia, and low erythrocyte sedimentation rate are not specific signs of Kawasaki disease. They may indicate other cardiac or inflammatory conditions.

Choice B reason: Abdominal pain, vomiting, and restlessness are not typical signs of Kawasaki disease. They may suggest other gastrointestinal or neurological problems.

Choice C reason: Coarse breath sounds, abnormal ECG, and joint pain are not common signs of Kawasaki disease. They may indicate other respiratory, cardiac, or rheumatic disorders.

Choice D reason: This is the correct choice. Fever, "strawberry tongue" and peeling palms and soles are characteristic signs of Kawasaki disease, which is a rare but serious condition that causes inflammation of the blood vessels. Other signs include red eyes, swollen lips, rash, and swollen lymph nodes.

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.