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Re: 'exactly' when does 1st trimester end - 12weeks 0days or 12weeks 6days ? (more)

From: Gayle (anonymous@obgyn.net)
Tue, 12 Nov 2002 10:56:59 -0600 (CST)


At Tue, 12 Nov 2002, ambika wrote: >
>i read on the net that each trimester is 13 weeks and 2 days to be very
>precise, then why do we say that the first trimester lasts 12 or 12+
>weeks? many thanks!

Based on a gestation of 280 days, a trimester would be about 93 days which would be about 13 weeks, 2 days. Some people say each trimester is 12 weeks... but that would make for 36 week gestation period instead of 40. Personally I decided on the 13 weeks, 2 days to be on the "safe" side, especially when I wanted to get into that second trimester!




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