National Center for Biotechnology Information NCBI NLM MEDLINE Attitudes humans pubmed abstract nih national institutes of health national library of medicine research support non-u.s. gov't female male Infant Comparative Study breast feeding Clinical Trial Health Promotion / methods* poverty areas health knowledge feasibility studies pmid:22405701 pmc6860737 doi:10.1111/j.1740-8709.2010.00265.x keriann h paul monica muti rebecca j stoltzfus dietary fats / administration & dosage* dietary supplements* / analysis feeding methods* food preferences practice* / ethnology infant food / analysis infant nutritional physiological phenomena* / ethnology mothers / education nutritional sciences / education rural health* / ethnology zimbabwe