Study design and participants
This randomized controlled trial study was conducted on 88 (44 in the experimental group and 44 in the control group) mothers of infants covered by comprehensive health service centers of Arak, Iran, from September 2021 to February 2022.Stratified random sampling was used for sample selection. According to socio-economic regions, the city was divided into 4 regions. Then 2 health centres were selected by simple random sampling with running a random sample command in SPSS software from each region (totally 8 centers). Furthermore, the participants were selected by systematic random sampling based on electronic registered system in each health center. In each region, based on simple random sampling, control group (CONSORT flow diagram of the study design. The figure shows the flow diagram of randomized controlled protocol