Last menstrual period April 18th due date is January 25th next year. Calculation of the due date should start from the first day of the last menstrual period, the month should be subtracted from 3 or added to 9, and the number of days should be added to 7. It is necessary for a professional doctor to check the week of pregnancy according to the size of the gestational sac and buds, head and hip length, etc. indicated by the ultrasound examination of the pregnant woman’s early pregnancy, and then project the expected date of delivery. Therefore, the expected date of delivery on April 18th of the last menstrual period is January 25th of next year. Pregnancy is calculated from the first day of the last menstrual period, totaling about 280 days, and the 40th week refers to the due date. For those who have not delivered by the due date, they should also follow the doctor’s instructions to strictly count the fetal movements and perform ultrasonography and fetal heart rate monitoring to assess the growth and development of the fetus and its intrauterine status. When symptoms such as abdominal pain and redness occur, it is necessary to go to the hospital in time.