“…Breastfed sucklings, for example, almost exclusively exhibit Bifidobacterium bifidum in their intestine [2]. Milk proteins which are supposed to be responsible for this modulation are for example lysozyme [3,4], lactoperoxidase [5][6][7], lactoferrin [7][8][9] and antibodies [10]. However, in vivo the ingestion of lactoferrin has only a marginal influence on the intestinal microflora [1 1].…”