Child Malnutrition: How to Recognise It and Feed Your Child Back to Safety

What is the difference between wasting and stunting?

Malnutrition in children is not a single condition. It comes in forms that look different, progress at different speeds, and need different responses. Understanding the difference shapes what you do next.

Wasting is low weight for height. It means a child is losing muscle and fat rapidly, usually because of too little food over weeks or an acute illness that prevents eating and absorption. Wasting is an emergency: a child with severe wasting can die within days if nothing changes. The body is consuming itself to stay alive.

Stunting is low height for age. It reflects months or years of insufficient nutrition, usually beginning in pregnancy or in the first two years of life. A stunted child may look well proportioned for their current height, but they are shorter than they should be for their age, and this carries long-term consequences for brain development, school performance, and earning capacity. Stunting cannot be reversed quickly; the most powerful time to prevent it is before it happens.

How to measure your child's MUAC at home

The mid-upper arm circumference (MUAC) is the most widely used field tool for screening acute malnutrition in children aged 6 months to 5 years. It requires nothing more than a simple tape measure. A 2024 scoping review in the Pan African Medical Journal confirmed that mothers themselves can learn and apply MUAC screening accurately, making it viable even where health workers are scarce.

To measure, let your child's arm hang relaxed at their side. Find the midpoint between the shoulder tip and the tip of the elbow. Wrap the tape around that midpoint snugly but without pressing into the skin. A reading of 12.5 cm or above is generally acceptable. Between 11.5 and 12.5 cm indicates moderate acute malnutrition. Below 11.5 cm indicates severe acute malnutrition requiring immediate medical care.

MUAC alone does not tell the whole story. A child with swollen feet, legs or face alongside any degree of thinness needs a medical assessment even if the MUAC reads in the moderate range, because oedema can mask an underlying severe protein deficiency called kwashiorkor.

Warning signs that need the same-day hospital visit

Some signs tell you that a child needs a health facility today, not tomorrow. A severely malnourished child has a weakened immune system, fragile circulation, and almost no reserve to draw on. The first hours of the right treatment are far more effective than the same treatment started days later.

Watch for any of the following and go to the nearest health centre or hospital immediately: the child refuses to eat or drink anything for a full day; the feet, legs, hands or face are swollen; the child is limp and does not respond normally to your voice or touch; breathing is unusually fast or laboured; or MUAC falls below 11.5 cm.

Refeeding syndrome: why feeding too fast can be fatal

Refeeding syndrome is one of the most dangerous and least known risks in the treatment of severe malnutrition. When a body has been starved for a long time, it adapts to extremely low levels of potassium, phosphorus and magnesium. When food is suddenly reintroduced in large amounts, these minerals fall sharply in the blood as cells rush to absorb them. This sudden shift disrupts heart rhythm, muscle function and nerve conduction, and can cause cardiac arrest.

A 2025 study published in the Journal of the College of Physicians and Surgeons Pakistan examined children aged 6 to 59 months with severe acute malnutrition and found that refeeding syndrome was a real and dangerous complication when structured protocols were not followed. The study emphasised starting with very small amounts of food and increasing gradually under observation.

The practical message for parents is this: if a child has been severely underfed for weeks, do not try to make up the deficit quickly with large meals or formula top-ups at home without medical guidance. Nutrition centres begin with a stabilisation phase lasting several days before gradually increasing intake. This protects the child while their body readjusts.

Ready-to-use therapeutic food: what it is and where to find it

Ready-to-use therapeutic food (RUTF) is a calorie-dense, nutrient-fortified paste, most commonly resembling peanut butter, designed to treat acute malnutrition in children without medical complications. It needs no water, no cooking, and no refrigeration, which makes it well suited to crisis conditions. One sachet per day alongside continued breastfeeding covers the full treatment requirement for most children with moderate to severe wasting.

UNICEF and the World Food Programme distribute RUTF through primary healthcare centres, nutrition stabilisation units and community distribution points in Yemen, Syria, Gaza and Sudan. If a health worker tells you that your child qualifies for community-based management, this typically means taking home a weekly supply of RUTF with scheduled follow-up visits.

A 2017 review in the journal Advances in Nutrition examined nutrition interventions across multiple conflict-affected settings and found that community-based distribution of therapeutic food was effective when combined with regular monitoring and caregiver education. Programmes that train mothers to identify deterioration early and bring children back promptly had significantly better outcomes than distribution alone.

Kwashiorkor and marasmus: two faces of severe malnutrition

Doctors use two terms for the severe forms: marasmus and kwashiorkor. Marasmus is the more common form and results from severe deficiency of both calories and protein. A child with marasmus looks visibly thin and wasted, with loose skin, prominent bones and a face that looks aged beyond their years. The body has consumed its fat and muscle reserves to survive.

Kwashiorkor is more deceptive. It occurs when calorie intake is roughly adequate but protein is severely deficient. The body cannot maintain fluid balance without protein, so fluid leaks into the tissues, causing swelling of the feet, legs, belly and sometimes the face. A child with kwashiorkor may look almost normal in weight, or even heavy, while actually being in a life-threatening nutritional crisis. The hair often becomes sparse and may turn reddish-brown or yellow.

Both conditions are medical emergencies. Kwashiorkor is sometimes mistaken for good health, for allergic swelling, or even for obesity, and this delay costs lives. If you see a child with puffy feet or legs and a distended belly alongside weakness or hair changes, the right response is a health centre visit, not watchful waiting.

Prevention: nutrition in the first 1,000 days

The period from conception to the second birthday, roughly 1,000 days, is the window where nutrition has the greatest and most lasting influence on a child's brain, height and immunity. What happens in these days cannot be fully made up for later. This is not a reason for despair in difficult circumstances; it is the strongest argument for prioritising the pregnant woman and the young child when food is scarce.

Exclusive breastfeeding for the first six months gives the infant everything they need and protects against the diarrhoea and infections that accelerate malnutrition. After six months, complementary feeding should begin with soft, nutrient-rich foods while breastfeeding continues. In crisis settings, giving a young infant sweetened tea, animal milk, or thin porridge before six months provides almost no nutrition and raises the infection risk substantially.

When food is scarce for the whole family, prioritising egg, legumes such as lentils and chickpeas, and dark green leaves for the young child and the breastfeeding mother can make a significant difference within a very limited budget. These foods are also more available and affordable than formula across most of the region.

When and how to access nutrition programmes

You do not have to manage this alone. In Yemen, Syria, Gaza and Sudan, community nutrition programmes run through WHO, UNICEF, MSF (Doctors Without Borders) and UNRWA provide free assessment, therapeutic food, and follow-up. These services exist specifically for crisis settings where the regular healthcare system cannot meet the need.

Seek out a nutrition centre if your child has not gained weight for more than one month despite adequate feeding, if MUAC falls below 12.5 cm, or if the child seems unusually lethargic or disinterested in eating. Early assessment costs nothing and makes a substantial difference to outcome.

If you can access a growth chart, recording your child's weight every one to two months gives you the most useful early warning available. A child who stops gaining weight for two or three months, even before visible wasting appears, is signalling that something needs to change. Early intervention at this stage avoids the emergency later.

In areas with mobile outreach teams, these teams visit communities regularly with measuring equipment and RUTF, removing the need to travel to a fixed centre. A community health worker, where one exists, can teach you how to measure MUAC correctly, identify danger signs, and refer the child for in-patient care when home-based management is no longer safe.

Malnutrition in the context of conflict and displacement

Severe acute malnutrition in young children is closely tied to armed conflict, collapsed health systems and repeated displacement, all of which are the daily reality for millions of families in Yemen, Gaza, Sudan and Syria. When food supply chains break down, primary care stops functioning, and families are forced to move repeatedly, nutritional deficits accumulate silently in the youngest and most vulnerable children.

The problem is not only food scarcity. Repeated bouts of diarrhoea from contaminated water, frequent respiratory infections, and the physiological stress of displacement all increase the body's nutritional demands while reducing absorption. A child with frequent diarrhoea cannot absorb what they eat adequately even when food is technically available. Treating infection and ensuring safe water alongside improving food intake is therefore essential to recovery.

Caregivers who understand how to measure MUAC and recognise early warning signs can save a child's life by accessing treatment while it is still straightforward. The difference between identifying moderate wasting and waiting until wasting is severe is enormous in terms of ease of treatment, risk of complications, and likelihood of full recovery. If this article has given you one practical tool to use today, measure that arm circumference.

Sources

• Majiwa PR, Chopera P, Matsungo TM et al: Family-led mid-upper arm circumference (FL-MUAC) approach and the screening of acute malnutrition in children aged 6 to 59 months in Africa: a scoping review, The Pan African medical journal, 2024
• Memon AS, Rafique M, Lail A et al: Refeeding Syndrome in Children Aged 6 to 59 Months with Severe Acute Malnutrition, Journal of the College of Physicians and Surgeons--Pakistan : JCPSP, 2025
• Carroll GJ, Lama SD, Martinez-Brockman JL et al: Evaluation of Nutrition Interventions in Children in Conflict Zones: A Narrative Review, Advances in nutrition (Bethesda, Md.), 2017
• Guesdon B, Faruqi MI, Siddiqui MI et al: Mid-upper arm circumference only protocol in Pakistan: missed opportunities for children suffering from severe acute malnutrition? A mixed-methods observational study, Public health nutrition, 2024
• World Health Organization: Management of severe acute malnutrition in infants and children, WHO guidelines
• UNICEF: The State of the World's Children 2023 report on child nutrition