Ethical considerations
Written informed consent was obtained from all the participants. Moreover, after the study, the training materials such as the booklets electronic, voiced PowerPoint, short educational messages, and educational photos were given to the control group through WhatsApp social network. The both groups also, received routine child care training through health workers, but the intervention group received the intervention program in addition to the routine training.The Ethical Committee of Arak University of Medical Science, Iran, approved the study protocol (ID number- IR.ARAKMU.REC.1399.298). The purpose of the study was explained to the participants, and then a written consent was obtained. The explanation and approval of the research delivered online for participation. Moreover social media research interventions require internet quotas to download learning media and researchers in this study by delivering compensated internet quotas try to minimize losses to participants. This study was registered in the Iranian Registry of Clinical Trials (IRCT20210202050228N1). Prospectively registered at 2021-May-21, (2021/05/21) available at: URL: 