WHO review finds limited health benefits of breastfeeding beyond first year

A comprehensive review by the World Health Organization challenges common assumptions, revealing little evidence that breastfeeding beyond a child’s first birthday offers significant health advantages for mothers or children, suggesting that continued breastfeeding is a matter of personal choice rather than proven benefit.

A World Health Organization review of 146 observational studies has found little solid evidence that breastfeeding beyond a child’s first birthday delivers clear health gains for either mother or child. The review, which covered 170 publications, says the effects on child development, growth, heart health and allergies remain uncertain, and the same is true for claimed maternal benefits such as lower risks of cancer, cardiovascular disease and bone disease. WHO’s own conclusion is that continuing breastfeeding into the second year can be a choice shaped more by what is practical and wanted by mothers and families than by proven medical advantage.

That matters because breastfeeding is still widely presented as a way to strengthen a toddler’s immune system and reduce illness. WHO’s general breastfeeding guidance says breast milk is the ideal food for infants, protects against common childhood illnesses and should continue alongside complementary foods up to two years and beyond. But the systematic review behind the recommendation does not show a consistent benefit for the outcomes parents often hear about most.

The clearest data in the review did not show lower rates of stomach bugs, respiratory infections, ear infections or hospital admission among children breastfed in the second year of life. A small Turkish study suggested fewer episodes of some infections, but the wider body of evidence did not replicate that result. The review also found no meaningful difference in obesity, developmental delay, intelligence or most measures of maternal health.

In some areas, the findings were at best neutral and in a few cases slightly worse for longer breastfeeding, including small differences in spatial reasoning, a higher risk of underweight or poor growth, and lower body mass index. The review did note an association with dental caries, or tooth decay, but that points to oral hygiene rather than a reason to continue breastfeeding.

For parents, the practical message is straightforward. If breastfeeding after 12 months works for the family, there is no reason to stop on health grounds alone. If it does not, the available evidence does not show that a child is missing out on a proven protective effect by weaning after the first year.