After getting the necessary permissions from the authorities in question and getting consent from the mothers for participating in the study, the kindergartens of Rasht and the samples will be selected randomly using a two stage cluster sampling. In the first stage, cluster sampling will be conducted using the list obtained from Guilan Welfare Organization, according to which 132 active kindergartens work in Rasht, and according to random numbers table and from each geographical point of Rasht (north, south, center, east and west), one kindergarten will be selected as the intervention and one kindergarten as a the control. Overall, 10 kindergartens will be sampled for intervention and control groups. Then, in the second stage of cluster sampling, in the selected kindergartens, given the register and with the help of random numbers table, the children from 3 to 5 will be selected and by holding a meeting to introduce the present study, we will talk with the mothers of these children on the participation in the study. Finally, in each of the two intervention and control groups, 55 subject with the inclusion criteria will be selected.