DUE DATE CALCULATOR
If you really want to pencil an actual day for birth into your diary, you could use Naegle’s Formula. Subtract three months from the first day of your last menstrual period (LMP), and then add seven days. This formula works if you have a 28-day menstrual cycle, and know that you ovulate on the fourteenth day of your cycle. So, LMP minus three months plus 7 days equals your due date, for example LMP: 1 January 2012 minus three months equals 1 October. Then add seven days and you have an 8 October due date. In the end, working out your baby’s gestational age will only give you a broad indication of when your baby will be born. Research has shown that labour is triggered by your baby’s lungs. As they hit maturity your baby’s lungs will trigger the release of the hormone oxytocin, which in turn kickstarts the labour process. However, no one can tell you when that will happen for your individual baby, and there are no conclusive research studies that explain at what point exactly in the hormonal chain of events lungs reach development; neither is there a way of testing how mature a baby’s lungs are before birth.