Try the babyMed due date calculator! Your pregnancy due date is calculated by adding 40 weeks (280 days) to the approximate first day of your last menstrual period or 266 days to the day of ovulation. Only 5% of women deliver their babies on their projected due date, so this date is just an estimate and delivery usually happens within 2 weeks

It is measured in centimeters and is often first taken at prenatal appointments starting at 20 weeks of pregnancy. The fundal height measurement in centimeters should be close to the fetus's gestational age in weeks. For example, if you are 27 weeks pregnant, your fundal height should be about 27 centimeters (give or take 2 centimeters).

After 12 hours, they should be able to give you a rough estimate of how much longer you can expect to wait before active labor begins. Once you reach active labor (about 6 centimeters dilated), you'll likely continue to dilate for another four or five hours before delivering your baby, if you're a first-time mom.

^{That magic number for effacement is measured as a percentage: At 70% effaced, you're getting close, and at 100%, your cervix is thinned out enough for your baby to come through the birth canal.}

If this is your first baby, come to the hospital when your contractions: Come every 3 to 5 minutes over an hour-long period. Last at least 45 to 60 seconds. If you've given birth before, come to the hospital when your contractions: Come every 5 to 7 minutes. Last at least 45 to 60 seconds.

Give it all you've got. The more efficiently you push and the more energy you pack into the effort, the more quickly your baby will make the trip through the birth canal. Stay focused. Maintain control and try to avoid frantic pushing, too — you don't want to push with your upper body or strain your face. Change positions.

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how many cm when giving birth