A child with severe anemia requires a unit of red blood cells (RBCs). The nurse explains to the child that the transfusion is necessary to:

Consuming a large amount of milk, such as a quart a day, can lead to iron deficiency anemia in toddlers. Milk is a poor source of iron, and excessive milk intake can displace other iron-rich foods from the toddler's diet.

Iron deficiency anemia occurs when the body lacks sufficient iron to produce enough hemoglobin, which is essential for oxygen transport in the blood. Toddlers are particularly vulnerable to iron deficiency anemia because they have increased iron needs for growth and development.

Option A (Obesity) and option B (Diabetes mellitus) are not directly related to the toddler's milk consumption. Obesity may be a concern if the child consumes excessive calories overall, but it is not specifically associated with milk intake. Similarly, diabetes mellitus is not directly related to milk consumption.

Option D (Rickets) is caused by a deficiency of vitamin D, not iron. Rickets results in weakened and deformed bones, and it is usually associated with inadequate sunlight exposure and insufficient dietary vitamin D. While milk is often fortified with vitamin D, excessive milk intake can displace other vitamin D sources in the diet and contribute to an increased risk of rickets, but the primary concern with excessive milk intake is iron deficiency anemia.

Hirschsprung disease is a condition where nerve cells are missing from parts of the intestine, leading to problems with bowel movements. The treatment for Hirschsprung disease often involves surgery to remove the affected portion of the bowel and create a temporary ostomy (stoma). An ostomy is an opening in the abdominal wall through which waste material can pass into an external pouch, bypassing the affected section of the intestine.
The correct statement by the parent that indicates an understanding of the teaching is C. The parent is expressing relief that the ostomy is temporary, meaning it is not a permanent situation. This response indicates that the parent has been informed about the nature of the ostomy and its planned duration, which is an essential aspect of preoperative teaching.
Let's go through the other options and explain why they are not the best choices:
A. "I'm glad my child will have normal bowel movements now." This statement is not accurate because, after the initial surgery with the creation of a temporary ostomy, the child will not have normal bowel movements. The ostomy is created to bypass the affected part of the intestine, and the child's bowel movements will be directed through the ostomy until further surgery is performed to reconnect the intestine.
B. "I want to learn how to use my child's feeding tube as soon as possible." While learning how to use a feeding tube may be relevant for certain medical conditions, it is not specifically related to Hirschsprung disease or the planned initial surgery. Hirschsprung disease primarily affects the bowel and its function, not the child's ability to eat.
D. "I want to learn how to empty my child's urinary catheter bag." Hirschsprung disease does not directly impact the urinary system, so there is no specific reason for the parent to learn how to empty a urinary catheter bag in the context of this condition or the planned surgery.