The statistical significance for overweight and obesity in preschool children was not shown in the results of univariate and multivariate analysis of nutritional characteristics in the infant period, as such factors: breastfeeding (p = 0.24), the addition of formula in the first 6 months (p = 0.992), duration of breastfeeding (before 12 months: p = 0.81, after 24 months: p = 0.97), age of the beginning of complementary foods (before 4 months: p = 0.25, after 6 months: p = 0.78).