Respectively assigned therapeutic mixture with reduced lactose (or completely lactose free), complete or partial hydrolysates, soy mixture. On the one hand the appointment of Clinical Nutrition partly improves clinical signs that accompany these disorders, but on the other hand, there are a number of significant disadvantages, which can often undo all the potential benefits and even worsen the condition of the child. First, clinical nutrition is often prescribed instead of breast milk, thus depriving thereby the child to receive a unique opportunity from a biological point of view of the product. Even a partial replacement of natural feeding usually leads to a sharp decrease in lactation, and eventually a full transition to replacement feeding. Secondly, many therapeutic mixture just do not match the physiological needs of the rapidly growing child. First of all, it relates to soy food as a child always need animal proteins, especially for the development of the immune system. Finally, thirdly, the introduction of therapeutic compounds, such as a asle, does not solve the problem, and without adequate treatment, even postpones the solution of this problem. Particularly harmful complete hydrolysates, which are not creating adequate pressure on the digestive system and eventually lead to the fact that the adaptive system of the body stops growing and actually atrophy due to this there are huge problems with the introduction of virtually any new products, as well as a strong worsening of food allergy. We believe that such a mixture (total hydrolysates) is unacceptable use of children as an outpatient therapeutic feeding. Thus, a physician, before recommending nutritional care, should carefully evaluate the feasibility of this step and to consider alternative possibilities. Based on years of experience out-patient admission for children under 1 year (more than 1000 patients per year), we have developed some criteria for appropriateness of therapeutic compounds. In the case of lactase deficiency is the determining factor in the clinical picture and the child's condition. We must remember that for children the first few months is a general functional immaturity of enzyme systems, moreover, in the process of forming is biocaenosis intestine. Therefore, if lactase deficiency offset (the child does not lag behind in physical development, it does not have severe diarrhea and pain), food is better not to change the (therapeutic mixture does not enter). In cases of food allergies are usually the cause is intestinal dysbiosis and the same enzyme immaturity. In most cases, we have successfully treated conditions such changes without food (the child remained in a natural feeding and continued to receive regular feeds). If the child is breastfed (and breast milk is enough), it is almost always desirable to recommend health food, but to seek alternative ways, such as the introduction of the enzyme lactase. Nutritional therapy may be recommended in decompensated cases, extreme forced a temporary measure, but not in lieu of therapy. Thus it is necessary to strive to eventually power a child has become a common, age-appropriate.