The assessment of maternal health includes two parts: real-time daily assessment and monthly assessment. During the three months before delivery and the three months after delivery (a total of 6 months), there will be three daily assessments (morning, noon and evening) required to be completed for 5 consecutive days each month, each time lasting approximately 1-2 minutes; After the 5-day daily assessment there will be a monthly assessment which takes approximately 30-40 minutes. All assessments are completed via a mobile app.