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Why do so many people say that pregnancy lasts 9 months when it actually lasts 10?

April 26, 2017actually lasts months Parenting people pregnancy

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Why do so many people say that pregnancy lasts 9 months when it actually lasts 10?

4 Answers

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They just say 9 months because that’s the right amount of time for a baby too develop completely mentally and physically.

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It depends on if you use 4 week months, which would equate to 10 months or calendar months which are really 4.33 weeks (52 weeks divided by 12 months). If you use 4.33 weeks, 40/4.33 is 9.2. That is where the 9 months comes from.

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This is because it DOESNT last 10 months! First, pregnancy is caluclated from the first day of your last period – you werent actually pregnant then – conception actually occurs about 2 weeks later – so in reality you are pregnant for 38 weeks – you are considered 2 weeks pregnant the day you conceive. It’s dumb. Second, a month is not exactly 4 weeks. 4 weeks is 28 days. A month is 30-31 days, so every month is 4 and a half weeks. If you do the math, it works out to 9 months. Sorry to burst your bubble.

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The Drs. calculate pregnancy by lunar months, which are 4 weeks per month, but remember that there are some months of 5 weeks instead of 4. They make it this way ’cause is easy to be calculated.