1996b-064 analysis babyfoods bottlefeeding breastfeeding breastmilk childnutritiondisorders children congresses contamination deficiencydiseases diseases healthaspects heavymetals history human infantcare infantformulas infants malnutritioninchildren malnutritionininfants metals milk nutrition nutritionalaspects pediatrictoxicology qv290s989h1981 rj216 socialaspects toxicity toxicology ws115p3711982 ws135b348m1995