1. The chromium in the diets of lactating Finnish mothers and of their breast milk was determined by graphite furnace atomic absorption.
2. The average maternal diet was estimated to provide approximately 30 μg Cr/d. Breast milk samples had a mean Cr content of 0.4 ng/ml, with a range of 0.1g-06g ng/ml.
3. Cr intake of the lactating mothers did not correlate with the corresponding breast milk Cr concentration.
4. The diets and the breast milk of these Finnish mothers were lower in Cr than those of any other population studied in the world.