Development and Application of a Midwife-Led Smart Tool for Healthy Gestational Weight Management

INTERVENTION: Intervention group:The intervention group will receive individualized, continuous gestational weight management via a WeChat Mini Program in addition to the care provided to the control group.;Control group:Routine antenatal health management; CONDITION: None PRIMARY OUTCOME: Proportion of women with appropriate gestational weight gain; SECONDARY OUTCOME: Total gestational weight gain;Delivery outcomes;Reproductive health literacy during pregnancy;Experience of antenatal care services; INCLUSION CRITERIA: 1.Women aged >=18 years; 2.Women registered for and receiving regular antenatal care at the study institution and planning to give birth at the same institution; 3.Able to access the Internet using a smartphone; 4.Possession of a mobile communication device required for participation in the study; 5.Willing to participate in the study and able to provide written informed consent; 6.Women with a singleton, term, viable pregnancy; 7.Women who plan to give birth and attend postpartum follow‐up at the institution where they receive antenatal care;