Introduction
In East and Southeast Asia, international marriages are on the rise and have substantial influence on the national populations (Health management for children during early childhood requires substantial information. The parents are often placed in diverse situations, and having access to the necessary childcare information can enable them to respond more flexibly and appropriately (Immigrants, specifically, often experience an even greater burden because they have to perform childcare in a new culture. It is reported that immigrant parents feel overwhelmed with a variety of challenges including the lack of family and community support, lack of access to linguistically appropriate services and resources, cultural conflict regarding parenting practices, fear related to social services, and language barriers (Mobile health (mHealth) interventions have been shown to be efficient in delivering tailored health-related information, which tends to be more effective than generic information at inducing behavioral change (While mHealth interventions offer numerous advantages, specific populations may require additional strategies to effectively replicate their effects. As many marriage immigrants may not be familiar with using mobile applications, implementing mHealth intervention alone may not be sufficient (This study aimed to develop, implement, and evaluate a tailored mHealth program with and without LHWs on health-promoting behaviors, eHealth literacy, and family strength in multicultural families with young children. The main study hypotheses are as follows:H1. There will be a significant increase in health-promoting behaviors among those who received the tailored mHealth intervention with and without LHW (mH and mH-L) compared to those who did not receive any intervention (control group).H2. There will be a significant increase in eHealth literacy among those who received the mHealth intervention with and without LHW (mH and mH-L) compared to those who did not receive any intervention (control group).H3. There will be a significant increase in family strength among those who received the mHealth intervention with and without LHW (mH and mH-L) compared to those who did not receive any intervention (control group).