“…Health-promoting lifestyles during pregnancy are important for alleviating maternal physical and mental stress (Bogaerts et al, 2013(Bogaerts et al, , 2017, maintaining optimal intrauterine environment and decreasing maternal and neonatal complications, for example preterm delivery, caesarean section, bleeding, maternal infection, obesity, hospitalisation, diabetes, low birth weight and early neonatal death (Ferrara et al, 2020;Oteng-Ntim et al, 2012;Procter & Campbell, 2014;Reijnders et al, 2019). It is evident that promoting healthy behaviours is cost effective as well as improving pregnant women's health (Jalili Bahabadi et al, 2020). However, no studies have explored the longitudinal changes of health-promoting behaviours throughout the pregnancy trimesters and the factors associated with longitudinal changes.…”