Participants
The study participants were healthy primiparas (aged 18–35 years; 30–31 weeks of gestation) with singleton, cephalic presentation, normal fetal development, and favorable conditions for vaginal delivery. All participants were expected to give birth in the research hospital and received the health education service of the pregnancy school starting from 28 weeks, had good cognitive function, and were willing to participate in this study and to use WeChat online service during pregnancy. Their family members also voluntarily accompanied them in the sessions of the group care.