Stunted growth
A child whose height-for-age value falls at least two standard deviations below the median of the World Health Organization's Child Growth Standards is defined as stunted. This medical definition establishes a clear threshold for impaired growth and development in early childhood. Stunting manifests as linear growth failure, often caused by malnutrition or chronic food insecurity. Endogenous factors like genetic conditions can play a role, but exogenous factors such as parasitic infection are common drivers. The condition is largely irreversible if it occurs within the first 1000 days from conception to two years of age. This specific window represents the critical period where interventions must happen to prevent permanent physical consequences.
Among children under five years of age, the global stunting prevalence declined from 26.3% in 2012 to 22.3% in 2022. It is projected that 19.5% of all children under five will be stunted in 2030. More than 85% of the world's stunted children live in Asia and Africa. In sub-Saharan Africa, 40 per cent of children under 5 years of age are stunted, while South Asia sees 39 per cent affected. The four countries with the highest prevalence are Timor-Leste, Burundi, Niger and Madagascar where more than half of children under 5 years old are stunted. Despite global progress, the prevalence of child stunting was greater than 30% in 28 countries in 2022. Most of these nations are located in sub-Saharan Africa, highlighting a geographic concentration of the crisis.
Almost all stunting occurs within the 1,000-day period that spans from conception to a child's second birthday. A recent risk assessment analysis for 137 developing countries found that the leading risk factors were fetal growth restriction followed by unimproved sanitation and diarrhea. It was estimated that 22% of stunting cases were attributable to environmental factors, while 14% were attributable to child nutrition. Poor maternal nutrition during pregnancy is a primary driver, as low maternal BMI predisposes the fetus to poor growth. Women who are underweight or anemic during pregnancy are more likely to have stunted children. In many publications, the causes for stunting are considered very similar if not the same as malnutrition, yet some contradict this notion.
Stunted children generally do not recover lost height, and they may experience long-term impacts on body composition and overall health. If a child is stunted at the age of 2, they tend to have a higher risk of poor cognitive and educational achievement in life. Stunted individuals may have physical and/or cognitive delays affecting their performance in careers. On a societal level, it has been estimated that stunting can affect a country's GDP by up to 3%. Women of shorter stature have a greater risk for complications during childbirth due to their smaller pelvis. They are also at risk of delivering a baby with low birth weight. This creates an intergenerational cycle where stunted growth passes from mother to child, perpetuating poverty and malnutrition across generations.
Three main factors are needed to reduce stunting: political commitment, nutritional modifications, and a strong foundation including safe water and sanitation. To prevent stunting, it is not just a matter of providing better nutrition but also access to clean water and improved sanitation. Studies have looked at ranking underlying determinants in terms of potency and found that percent of dietary energy from non-staples has the greatest impact. Access to sanitation and women's education follow closely behind. The goal of UN agencies, governments, and NGOs is now to optimize nutrition during the first 1000 days of a child's life. Recent works showed promise that intervention with egg may improve linear growth in children, though effects may not persist without long-term programs.
Brazil displayed a remarkable reduction in rates of child stunting under age 5, from 37% in 1974 to 7.1% in 2007. This happened in association with impressive social and economic development that reduced extreme poverty levels significantly. Peru designed and implemented a national strategy against child malnutrition called crecer which complemented a conditional cash-transfer program. After implementation, stunting went from 22.9% to 17.9% between 2005 and 2010. The State of Maharashtra in Central-Western India produced a large reduction in stunting rates from 44% to 22.8% from 2005 to 2012. These examples demonstrate how integrated community-based programs can achieve significant results even amidst immense challenges.
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Common questions
What is the medical definition of stunted growth in children?
A child whose height-for-age value falls at least two standard deviations below the median of the World Health Organization's Child Growth Standards is defined as stunted. This threshold establishes a clear measure for impaired growth and development in early childhood.
When does stunting occur and why is it irreversible after that time?
Almost all stunting occurs within the 1,000-day period that spans from conception to a child's second birthday. The condition is largely irreversible if it happens during this window because interventions must happen before age two to prevent permanent physical consequences.
Where are the highest rates of child stunting found globally?
More than 85% of the world's stunted children live in Asia and Africa with sub-Saharan Africa seeing 40 per cent of children under 5 years of age affected. The four countries with the highest prevalence are Timor-Leste, Burundi, Niger and Madagascar where more than half of children under 5 years old are stunted.
How does maternal health affect the risk of stunting in offspring?
Poor maternal nutrition during pregnancy is a primary driver as low maternal BMI predisposes the fetus to poor growth. Women who are underweight or anemic during pregnancy are more likely to have stunted children.
What percentage of global GDP can be lost due to child stunting?
On a societal level it has been estimated that stunting can affect a country's GDP by up to 3%. This economic loss results from reduced cognitive achievement and career performance among stunted individuals.