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For a child with hemophilia experiencing a joint injury, the best home treatment and therapy would be elevation and the application of ice to the affected joint. This approach helps reduce swelling and minimize bleeding in the joint.
Option A (factor VIII concentrates) is a treatment for hemophilia but is typically administered intravenously to replace the deficient clotting factor in the blood. It is not a home treatment for joint injuries.
Option C (nonsteroidal anti-inflammatory drugs - NSAIDs) may be used to manage pain and inflammation, but they do not address the underlying bleeding disorder in hemophilia or directly treat joint injuries.
Option D (DDAVP - synthetic vasopressin) is used in some types of hemophilia to temporarily raise factor VIII levels, but it is not typically used for joint injuries or as a home treatment.

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.