title: Optimal duration of exclusive breast feeding in low income countries.
authors.forename: Robert E
authors.initials: RE
authors.lastname: Black
authors.forename: Cesar G
authors.initials: CG
authors.lastname: Victora
mesh_terms: D000367:Age Factors; D001942:Breast Feeding / Q000706:statistics & numerical data*; D003906:Developing Countries; D005260:Female; D015658:HIV Infections / Q000635:transmission; D006801:Humans; D011203:Poverty; D013997:Time Factors; D014886:Weaning