[Human milk--some recent aspects of breast feeding].

New data on the quality and quantity of protein and nor-protein nitrogen in human milk are discussed in the first part of this review. The second part presents a short review of current knowledge on immunologically important components of human milk (secretory IgA, Lactoferrin, ligands for folic acid and vitamine B-12. Lysozyme, cells, induction of breast milk flora in the intestine). There are very good reasons to enhance breast feeding also in developed countries.