The World Health Organization (WHO) recommends exclusive breastfeeding for the first six months of life, followed by continued breastfeeding alongside solid foods for up to two years or beyond. These guidelines shape public health policy in virtually every country and are backed by decades of evidence on infant survival, child development, and maternal health.
The Core Recommendation
WHO’s position is straightforward: for the first six months, infants should receive nothing but breast milk. No water, no juice, no formula, no solid food. After six months, babies should start receiving nutritionally adequate complementary foods while breastfeeding continues. The organization frames two years as a minimum target rather than an endpoint, using the phrase “up to two years or beyond.”
This recommendation applies globally, across all income levels and regions. WHO also emphasizes early initiation, meaning the baby should be put to the breast within the first hour after birth. That first feeding delivers colostrum, a thick golden fluid rich in antibodies and nutrients that acts as a kind of first vaccine for the newborn. Early initiation also stimulates milk production and strengthens the emotional bond between mother and baby, which in turn makes sustained breastfeeding more likely.
Why WHO Prioritizes Breastfeeding
The health case is substantial and well documented. Breastfed infants have dramatically lower rates of hospitalization and death from the two biggest killers of young children: diarrheal disease and respiratory infections. WHO-commissioned research found that hospitalization rates among breastfed infants were 72% lower and mortality rates 77% lower for diarrheal illness compared to non-breastfed infants. Breastfeeding also reduced the severity of diarrhea episodes that did occur and lowered the risk of hospitalization and death from respiratory infections.
Beyond survival, breastfeeding appears to shape brain development. A review published in Pediatric Research found that breastfeeding was associated with roughly a 3-point advantage on cognitive tests for children born at term and about 5 points for those born preterm. In one analysis, children who received more breast milk scored 8.3 IQ points higher at ages seven to eight after adjusting for other factors. These are meaningful differences at a population level.
Benefits for Mothers
The health advantages aren’t one-sided. The risk of breast cancer drops by about 4.3% for every 12 months a woman breastfeeds, and women who breastfeed for more than a year see a roughly 26% reduction in breast cancer risk overall. The protective effect against ovarian cancer is even stronger, with one large meta-analysis finding a 37% reduction among women who breastfed for over 12 months.
There’s an important nuance here: the protection against breast cancer appears strongest for certain subtypes. A large study found that up to 15% of triple-negative breast cancer diagnoses in Black women and 12% in white women could have been prevented by breastfeeding for more than six months. However, breastfeeding did not show a significant association with reduced risk of hormone receptor-positive breast cancers, which account for about 80% of all diagnoses.
Guidelines for Mothers Living With HIV
WHO’s recommendations for mothers with HIV have evolved significantly as antiretroviral therapy has become more effective and accessible. The current guidance states that in settings where health services support lifelong antiretroviral treatment, mothers living with HIV should breastfeed for at least 12 months and may continue for up to 24 months or longer, just like the general population. The key requirement is consistent use of antiretroviral medication, which dramatically reduces the risk of transmission through breast milk.
In these settings, the duration of breastfeeding should not be restricted as long as the mother is receiving and adhering to treatment. Breastfeeding should only stop once a nutritionally adequate and safe diet without breast milk can be reliably provided. This is a critical distinction in regions where clean water and affordable formula are not guaranteed, since the risks of not breastfeeding (malnutrition, waterborne illness) can outweigh the small residual risk of HIV transmission when the mother is on treatment.
How WHO Protects Breastfeeding in Practice
WHO doesn’t just issue recommendations. It has built a regulatory and institutional framework designed to make breastfeeding easier to start and sustain.
The International Code of Marketing of Breast-milk Substitutes, adopted in 1981, restricts how infant formula can be promoted. The core principle: formula should be available when needed but never marketed in ways that discourage breastfeeding. This means no advertising to the general public, no free samples in hospitals, and no idealized images on packaging that position formula as equivalent to breast milk.
At the hospital level, WHO’s Ten Steps to Successful Breastfeeding outlines what maternity facilities should do to support new mothers. Revised in 2018, the steps include practical measures like ensuring staff have the training to help with breastfeeding, facilitating immediate skin-to-skin contact after birth, keeping mothers and babies in the same room around the clock, helping mothers recognize hunger cues, and counseling on the risks of bottles and pacifiers in the early weeks. Hospitals that fully implement these steps can earn “Baby-Friendly” designation through a joint WHO and UNICEF initiative.
Where the World Stands Today
Despite decades of advocacy, global breastfeeding rates remain below WHO targets. Between 2016 and 2022, only 48% of infants under six months were exclusively breastfed worldwide. Just 46% of newborns were breastfed within the first hour of birth, well short of the 70% target. WHO and UNICEF have set a goal of reaching at least 60% exclusive breastfeeding in the first six months by 2030.
The gap between recommendation and reality reflects a web of barriers: inadequate maternity leave policies, workplaces without pumping facilities, aggressive formula marketing, insufficient support from healthcare providers, and cultural pressures that vary widely by region. WHO’s approach treats breastfeeding not as an individual choice made in isolation but as a public health outcome shaped by the systems around mothers, from hospital protocols to labor laws to advertising regulations.