Introduction: The issues of modelling the process of determining the diet of pregnant women in three trimesters of fetal development are considered. Aim: The analysis of the dynamics of the development of the fetus, taking into account the saturation of nutrients and vitamins in food. Scientific evidence of nutrigenomics indicates the effects of nutritional factors at the gene level. Method: A successfully developing new scientific field, epigenomics, is studying the influence of various environmental factors, and above all nutrition, on the expression of maternal and fetal genes. The main types of nutrients in products that provide a rational diet for pregnant women have been identified. Even when using a diverse set of products in nutrition, the majority of women have found an insufficient supply of vitamins and minerals in various combinations. Conclusion: The reason for this is a significant decrease in the content of vitamins and minerals in food, which is associated with the use of active, and sometimes aggressive agricultural technologies in agriculture.