title: The optimal duration of exclusive breastfeeding.
mesh_terms: D000367:Age Factors; D015982:Bias; D001942:Breast Feeding / Q000009:adverse effects* / Q000706:statistics & numerical data*; D002675:Child, Preschool; D003906:Developing Countries; D019317:Evidence-Based Medicine; D014943:Global Health; D006128:Growth / Q000502:physiology; D006801:Humans; D007223:Infant; D007225:Infant Food; D007227:Infant Nutritional Physiological Phenomena; D007229:Infant Welfare; D007231:Infant, Newborn; D012016:Reference Values; D013997:Time Factors; D014944:World Health Organization