Which of the following is the most common cause of failure to thrive in infants in developing countries?

Explanation

## Epidemiology of Failure to Thrive **Key Point:** In developing countries, failure to thrive (FTT) is predominantly caused by **organic, nutritional factors** — inadequate caloric intake due to poverty, food insecurity, and malnutrition accounts for >80% of cases. ### Causes of FTT: Organic vs. Non-Organic | Category | Common Causes | Prevalence in Developing Countries | |----------|---------------|------------------------------------| | **Nutritional/Inadequate intake** | Poverty, food insecurity, improper feeding, diluted formula | ~60–80% | | **Gastrointestinal** | Chronic diarrhea, malabsorption, parasites | ~10–15% | | **Infections** | Recurrent respiratory infections, tuberculosis, HIV | ~5–10% | | **Congenital/Cardiac** | CHD, renal disease, metabolic disorders | ~2–5% | | **Non-organic/Psychosocial** | Maternal depression, neglect, inadequate bonding | ~5–10% | **High-Yield:** The distinction between **organic** (medical cause) and **non-organic** (psychosocial/environmental) FTT is crucial: - **Organic FTT** dominates in resource-poor settings (malnutrition, infections, parasites). - **Non-organic FTT** is more common in developed countries (maternal depression, feeding dysfunction). ### Clinical Recognition **Clinical Pearl:** In a child presenting with FTT in a developing-country context, always assess: 1. **Dietary history** — frequency, quantity, quality of feeds 2. **Socioeconomic factors** — family income, food availability 3. **Feeding practices** — bottle dilution, weaning age, complementary feeding 4. **Infection burden** — diarrhea, respiratory symptoms, parasitic exposure **Tip:** The presence of **weight loss or plateau** on the growth chart in the context of **poverty and food insecurity** is pathognomonic for inadequate caloric intake and should be the first diagnosis to exclude. [cite:Park 26e Ch 10]