Intestinal microbiotics make up about 80 % of our immunity. The biggest colonization by these microorganisms happens in the first 1000 days in the life of a child, which is why it is important to maintain a balanced diet, to properly support growth and diversity of an intestinal flora. In the theoretic part of my thesis I will look closely on composition of breast milk and on other kinds of substitution of dairy nutrition. You will learn that many factors affect the composition of intestinal microbiotics. For if it comes to dysmicrobia, for example as a result of long-term use of antibiotics, it could lead to development of metabolic, immunologic and psychic issues. The goal of my bachelor thesis was to learn the contents of probiotics, prebiotics, postbiotics and synbiotics in breast milk, and in the formulas in the 1st, 6th, 12th and 18th month. My sources were professional literature and the websites of chosen dairy nutrition. For learning the exact intake of the observed substances I evaluated menus from 10 respondents. Breast milk is the most natural form of nutrition, which is why it is used as a template for making the substitution of dairy nutrition. The closest to breast milk in contents of synbiotics are brands Hipp BIO combiotik and BEBA COMFORT HM-O. Nutrilon advance has the most similar count of prebiotics, which was confirmed by observing the specific intake from menus. Nutrilon and Hami are only brands containing postbiotics thanks to the process of directed fermentation Lactofidus. This data should help in deciding what substitution of dairy nutrition to choose, if a child cannot be breastfed. But since this thesis does not evaluate the complete contents of the formulas, but rather the contains of the observed substances, we cannot presume the brands with the best results are the best option of nutrition. The choice of nutrition should be discussed with a pediatrician or a nutritionist.