The intestinal microbiota, also known as the intestinal microflora, or the intestinal flora, is a group of microorganisms (microbiome), mainly bacteria, which form a complex ecosystem in the digestive system. In humans, it is one of the elements of his physiological biota [1]. Childbirth is an important stage in the colonization of the human digestive system by the microbiota. The form of feeding also plays an important role in the colonization of the intestines of a newborn and infant [2]. Breast milk has many benefits. Breastfeeding plays an important role in shaping baby's gut microbiota. Mother's milk contains healthpromoting bacteria that support the primary colonization of the newborn's intestines. Diet has a significant influence on the formation of the intestinal microbiota. Therefore, it is important that a woman not only during the entire pregnancy, but also before pregnancy, takes care of a varied, balanced and rich in prebiotics diet [3].