Why do the Japanese count pregnancy as 10 months?

I’ve found two totally different explanations for this:

- The Japanese are still basing what they say on the traditional lunar calendar of 28 days per month (perhaps simplifying from the traditional 10 months and 10 days saying)

and/ or

- The Japanese count from the last period rather from the first missed period

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1 Comment

  1. takajolily said,

    April 28, 2014 at 7:53 am

    They are both true. Both Japanese and western doctors and midwives medically count pregnancy as 40 weeks starting from the first day of the last period. It’s the only sure date you can go on, since most women can’t tell when they ovulated, and fertilization can happen several days after sex. All women are already 2-3 weeks pregnant before they’re even pregnant, lol! 40 days is *approximately* 9 calendar months. In Japan, the 40 weeks are simply divided into ten 4-weeks ‘months’ that obviously do not match calendar months. Japanese women count how pregnant they are according to the chart they get from the doctor, not what month it is on the calendar, calling themselves two months pregnant at six weeks. Western doctors count the pregnancy in weeks, and western women call themselves one month pregnant when they are six weeks, and tend to count by the calendar month after that (though they usually switch back to weeks from about week 37).


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