Objectives This study targeted public health nurses in a Japanese municipality that had newly adopted the core components of the Finnish system to provide continuous support to families with children until preschool. It sought to analyze changes in their perceptions for activities in maternal and child health care before and after the adoption.Methods Relevant data were collected through semi-structured focus group interviews, following an interview guide, conducted from September to October

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... 0. The study protocol was approved by the Ethics Committee of Osaka City University in Japan.Results A total of 12 public health nurses participated. Prior to the adoption of the system modelled on Finnish practice, these nurses were dedicated to addressing the risks regarding families with children (especially those at high risk) through continuous engagement. However, they were hesitant to proactively engage with families at lower risk as non-continuous, one-off engagements resulted in a patchwork response. After the system was adopted, the nurses became aware of the trust cultivated with families under their care, which included those at lower risk, that enabled them to respond to the changing needs flexibly. The nurses recognized that they had acquired the capability to notice the subtle signs of changes, engage more proactively with the families under their care, and deliver the necessary preventive interventions at an early stage. They also demonstrated joy and satisfaction derived from the growth of children and mothers under their care, as well as keen awareness of the need to improve their professional skills, even though they were busy.Conclusion These findings indicate that the continuous support system modelled on the core components from Finland enables public health nurses to proactively engage with families at lower risk and deliver preventive interventions at an early stage. The system also motivated Japanese public health nurses who found greater pleasure in their work.