Naegele rule



  • noun a method used to determine when a pregnant woman is likely to go into labour, in which nine months and seven days are added to the date on which her last period started. If the woman does not have a 28-day menstrual cycle, an adjustment is made: e.g., if she has a 26-day cycle you would subtract 2 days from the Naegeleā€™s estimated due date.