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Most doctors use Naegele's Rule, which is where we get the 40 week due date. How do they come up with these s, anyway? People who tell their family and friends a due date may have to endure 50 calls a day asking, "is the baby here YET?

Our language about due dates reflects our need for things to be on time. The calculator on this can help you work out when you might expect your conceeption to arrive. This calculation is calculated from the first day of your last period, based upon a day cycle and the assumption everyone ovulates on day But like most questions about life and about children, the answer is usually more complicated than that.

When was the first day of your last period? Those fun little due date wheels usually follow Naegele's Rule.

For example, 15 4 Day Year Cycle length in days Some women's cycles are not exactly sate days. I'm pretty proud as I did most of the coding and math myself!

But because most due dates bills, library books are deadlines, we tend to project that framework onto birth. The Wood's Method, sometimes called Nicol's Rule, is based on research and reflects the conceptio important points: those with cycles longer or shorter than 28 days do not ovulate on the 14th day; Wood's method adjusts based on average cycle length, bringing the whole pregnancy forward or back a bit for accuracy first babies come a little later than subsequent births estimates that first babies come on average 41 weeks, 2 days; subsequent babies around 40 weeks, 5 days All that said, here's a fairly comprehensive, queer-friendly, IVF-inclusive due date calculator.

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Pregnancy normally lasts from 37 weeks to 42 weeks from the first day of your last period. Adjust the cycle length if your cycle is shorter or longer than 28 days.

We'd prefer not to see babies come very early or late, but most babies come within a window of weeks on either side of the due date--right on time. But babies are not library books--no one's going to charge your baby an overdue fine.

And if your cycle is a lot shorter or a lot longer, your dates will dahe off even further. Though this is the average, most of us have cycles that tend to be a little shorter or a little longer, and the Fund phase the phase preparing for ovulation is the one that changes with cycle length, so this throws off the due date. Let's see what we come up with Even the baby is considered "early" or "late.

Problems with Naegele's Rule: It's based on the "research" of Harmanni Boerhaave, a botanist, not a birth professional or even a human biologist, who came up with the 40 weeks thing when he noticed that okt in the Bible are described as being about 10 lunar months, which is days.