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Wiki weeks and trimesters

akaeb

Networker
Messages
33
Location
Lakeville, IN
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What weeks officially make up the 1st, 2nd, and 3rd trimester? I had found that the 1st trimester was less than 14 weeks. The 2nd trimester was 14-28 weeks and the 3rd trimester is 28-delivery. But I also have seen 1st trimester as less than 12 or 13 weeks.

Thanks!
 
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