My Child Is Underweight: Causes, Evaluation, and What Helps

Every parent watches their child's growth anxiously. When a child seems smaller than their peers, or the paediatrician says the weight has fallen on the growth chart, the worry is immediate. Here is how to think about it, what the doctor evaluates, and what helps.

What Is Normal Growth?

Children grow at different rates. Indian children are, on average, smaller than many Western reference populations. A child consistently at the 10th percentile is growing normally — just on the smaller end of the normal spectrum. What the doctor watches for is:

• Crossing of percentile lines downward (e.g. from 50th to 10th percentile over 6 months)
• Weight gain that has completely plateaued
• Weight falling significantly below expected for age

Common Causes of Poor Weight Gain

• Inadequate caloric intake: The most common cause. May be due to feeding difficulties, picky eating, poor appetite, or simply not enough food being offered
• Malabsorption: Coeliac disease, cow's milk protein allergy, chronic diarrhoea affecting nutrient absorption
• Chronic illness: Congenital heart disease, kidney disease, recurrent infections, tuberculosis
• Developmental issues: Oral motor difficulties, autism, ADHD affecting feeding behaviour
• Thyroid dysfunction: Hypothyroidism can cause growth failure
• Emotional deprivation (uncommon but important to consider)

What the Doctor Will Do

The paediatrician will take a detailed feeding and growth history, examine the child, and may order targeted investigations — not a battery of every test. Common investigations include CBC, thyroid function, and sometimes stool examination, kidney function tests, or coeliac screening depending on the clinical picture.

What Actually Helps

• Calorie-dense foods: Adding ghee, butter, oil, and nuts to foods rather than restricting fat
• Structured meal and snack times: 3 meals + 2–3 snacks daily, without grazing or constant milk/juice in between
• Turn off screens at mealtimes: Children eat less when distracted by screens
• Avoid force-feeding: It worsens feeding aversion. A calm, positive mealtime environment matters
• Treat underlying causes: If an organic cause is found, treating it usually results in catch-up growth

"In the majority of cases, a 'small' child is simply constitutionally small — often just like a parent. But a child who was growing well and has fallen off the growth curve deserves investigation. Don't just assume it's normal without checking."

Dr. Sushma B provides growth and nutrition assessments at Sri Anand Child and Neuro Center, Chanda Nagar. Call +91 90633 66983.