en Midwifery Original Article <div style="text-align: justify;"><span style="font-family:Times New Roman;"><span style="font-size:12px;"><b>Background:</b> The total fertility rate (TFR) has dropped to below the replacement levels in numerous countries, which necessitates new educational approaches and behavioral models to encourage a more positive societal view of childbearing. The present research aims to design, implement, and evaluate an intervention based on the multi-theory model (MTM) aiming at boosting childbearing intentions among Iranian single-child women of reproductive age.<br> <b>Methods:</b> This mixed-methods study, designed in three phases, will first explore childbearing intentions qualitatively through in-depth interviews, with the resulting data analyzed using a directed content analysis based on the MTM. Second, the themes identified from this phase will then be used to develop and psychometrically validate a new measurement tool. Third, a field trial will be conducted to implement and evaluate an MTM-based educational intervention. Data will be collected with the validated tool both pre- and post-intervention, with follow-ups at three, six, and nine months to assess pregnancy outcomes. The effectiveness of the program and participant feedback will be analyzed via descriptive statistics, paired t-tests for within-group comparisons, and repeated measures analysis of variance (ANOVA) for between-group differences over time. All statistical analyses will be performed using SPSS version 22.<br> <b>Conclusion</b>: This study represents the first known application of the MTM to investigate childbearing intentions among single-child women. Developing and assessing a culturally-adapted intervention has the potential to boost individuals&rsquo; childbearing intentions and generate evidence for guiding reproductive health policies in settings experiencing a decline in fertility.</span></span></div> Childbearing, Pregnancy, Health behaviour, Reproductive behavior, Multi-theory model 14 22 http://nmj.goums.ac.ir/browse.php?a_code=A-10-1466-2&slc_lang=en&sid=1 Tayebeh Mokhtari Sorkhani arianmokhtari2@gmail.com 100319475328460016388 100319475328460016388 No Social Determinants of Health Research Center, Non-Communicable Diseases Research Institute, Department of Health Education and Health Promotion, School of Public Health, Shahid Sadoughi University of Medical Sciences, Yazd, Iran Mahshid Bokaie mah-bokaie@yahoo.com 100319475328460016389 100319475328460016389 No Research Center for Nursing and Midwifery Care, Comprehensive Research Institute for Maternal and Child Health, Department of Midwifery, School of Nursing and Midwifery, Shahid Sadoughi University of Medical Sciences, Yazd, Iran Farzan Madadizadeh statlearningeasy@gmail.com 100319475328460016390 100319475328460016390 No Medical Informatics Research Center, Institute for Futures Studies in Health, Kerman University of Medical Sciences, Kerman, Iran Manoj Sharma manoj.sharma@unlv.edu 100319475328460016391 100319475328460016391 No Department of Social and Behavioral Health, School of Public Health, University of Nevada (UNLV), Las Vegas, United States; Department of Internal Medicine, Kirk Kerkorian School of Medicine at UNLV, Las Vegas, United States Seyed Saeed Mazloomy Mahmoodabad Mazloomy.mm@gmail.com 100319475328460016392 100319475328460016392 Yes Social Determinants of Health Research Center, Non-Communicable Diseases Research Institute, Department of Health Education and Health Promotion, School of Public Health, Shahid Sadoughi University of Medical Sciences, Yazd, Iran