Regarding the issue of due date

Patient's question:

No

Doctor's answer:

The calculation of the due date starts from the first day of the last menstrual period: the month of the due date is the month of that month. If it is greater than 3, subtract 3; if it is less than 3, add 9 to get the birth month. Add 7 to the day: if calculated by the lunar calendar, the date of the last menstrual period plus 14 days is the birth date.