Why do we calculate the length of a pregnancy from the first day of a women’s last period?

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Why do we calculate the length of a pregnancy from the first day of a women’s last period?

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Anonymous 0 Comments

Because for many centuries thats all that was known.
It would need a major co-ordination of all medical professionals around the world to change it, plus all the textbooks. Honestly, we CBF, there are more important things to worry about.

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