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Background: breast milk offers numerous advantages biological and emotional. However, in some situations, can transfer harmful elements for the health of infants.  Objective: to determine lead levels in the blood and milk of mothers whose children frequent a primary mother-child health care.  Methods: a cross-sectional, observational and descriptive study of 70 healthy women who were breast-feeding babies younger than six months during 01/04/2011 to 30/09/2011. Lead determination was performed by mass spectrometry with inductively coupled plasma. A linear regression model was adjusted to determine the association between lead concentrations in maternal milk and blood. The estimated values of the difference between means and their 95% confidence intervals were obtained.  Results: mean lead concentration in milk was 1.462 ng/mL and blood lead concentration was 1.801 μg/dL.  Conclusions: human milk is not a source of contamination for the babies in this area. However, more studies are needed in other regions of the country in view of the growing evidence of foci of lead contamination, which may represent an occult risk for the population.

Determination of lead concentration in breast milk and blood of lactanting women in an interior city of Brasil