The due date for a pregnancy in the third month of the lunar calendar may be in the twelfth month of the lunar calendar or early January of the following year. The last menstrual period is calculated according to the lunar calendar, the month of the lunar calendar is greater than three minus three, less than three plus nine, and the date plus fourteen, which can be deduced the expected date of labor. The last menstrual period in the lunar calendar is in the month of three, the date is in the first and middle of the month, the month of expected labor is in the twelfth month of the lunar calendar, the date is in the second half of the month, and the month of expected labor is in the beginning of January of the following year. According to the time of the last menstrual period can be deduced the expected date of delivery, the expected date of delivery is just full of forty weeks, 280 days, ten months, not all pregnant women to the expected date of delivery of the fetus will be delivered down, the expected date of delivery is delayed or two weeks ahead of the time within the delivery is normal. After pregnancy, you should do a good job of maternity checkups during pregnancy, and find out the problems in a timely manner.