Insufficient iodine intake is most dangerous during the prenatal stage and in early childhood. Objective. To evaluate the efficacy of iodine deficiency correction in toddlers attending kindergarten. Patients and methods. Efficacy of iodine prophylaxis was analyzed in three stages: 1) in infancy depending on iodine level in breast milk; 2) after one year of age when children started to receive regular food (according to age-specific reference ranges); 3) correction of iodine deficiency in children receiving adapted stage 3 baby formula. Results. We found that smoking, physical inactivity, anemia, and exposure to harmful chemicals had a negative impact on iodine level in the breast milk. Children whose mothers received potassium iodide demonstrated normal coefficient of neuropsychiatric development by their third month of life significantly more often than those whose mothers did not receive potassium iodide (in this group every second infant had some developmental delay). None of the children over 1 year of age who started to receive regular food had severe iodine deficiency. Nutritional correction with adapted stage 3 baby formula in 50 children aged 1 to 3 years ensured positive changes in their health status with a 2-fold decrease in vegetative complaints. Receiving of an adapted stage 3 baby formula increased median urinary iodine excretion from 78 μg/L [34–112] to 113 μg /L [55–174]. Key words: adapted baby formula, toddlers, iodine deficiency, correction, median urinary iodine excretion