Estimated due date

The expected date of birth is calculated using the first day of the last menstrual period as the start of the expected period. The normal pregnancy time is about 265 days. The calculation methods include: calculation based on the last menstrual period, calculation based on the fetal movement date, calculation based on the basal body temperature curve, calculation based on the B-ultrasound, time estimation from the start of morning sickness, and approximate estimation based on the height of the uterine floor.