A 9-month-old infant is brought to the pediatric outpatient clinic due to poor weight gain. Physical growth parameters plot weight below the 3rd percentile, while head circumference and length remain at the 50th percentile. Detailed nutritional assessment reveals that the parents dilute infant formula with double the recommended amount of water due to financial distress and misunderstanding of instructions. The infant has normal developmental milestones and an otherwise normal physical examination. What is the primary diagnosis and initial management?

Answer and explanation

Correct answer: C. Non-organic failure to thrive; parent nutritional formula education

  1. Step 1: Failure to thrive (FTT) is defined as weight falling below the 3rd percentile or crossing two major percentile lines downward.
  2. Step 2: More than 80% of pediatric FTT cases are non-organic, resulting from inadequate caloric intake due to poverty, improper formula preparation, or psychosocial neglect.
  3. Step 3: Preserved head circumference and length with isolated weight lag strongly point to nutritional deficit rather than primary endocrine or genetic disorder. The cornerstone of management is nutritional education, proper caloric formula preparation (20 kcal/oz standard), and social support.
Answer
Non-organic failure to thrive; parent nutritional formula education.
Why not the others: 'Cystic fibrosis' presents with steatorrhea, recurrent pulmonary infections, and fat-soluble vitamin deficiencies; 'Celiac disease' usually presents after introduction of dietary gluten with chronic diarrhea and abdominal distension; 'Growth hormone deficiency' leads to proportionate short stature with delayed bone age.

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