When is kwashiorkor most likely to occur?

Kwashiorkor is a form of malnutrition that typically arises due to a deficiency of protein in the diet. The most critical period for its occurrence is often related to weaning from breastfeeding. When a child transitions from breast milk, which is nutrient-rich, to a diet that may be lacking in essential proteins—especially if this shift occurs during a time of increased nutritional demand—there is a heightened risk for developing kwashiorkor.

When a new sibling is born, the family dynamics might shift, leading to decreased attention and resources for the older child. Consequently, the older child may receive less nutritional support or may be weaned prematurely from breastfeeding. This combination of reduced protein intake and possibly increased stressors related to family changes contributes significantly to the likelihood of kwashiorkor occurring.

In the context of the development stages presented, the correct timing for the onset of kwashiorkor aligns with the period soon after weaning, which suggests that it could occur as a result of a new sibling arriving and altering the nutritional environment for the child.