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How does the pregnancy trimester system work?

By Andrea Rodrigo.
Last Update: 11/02/2017

A normal pregnancy, that is, a full-term pregnancy, is divided into three trimesters. In total, a full-term human pregnancy is expected to last 40 weeks, although it can cary from 37 to 42. Each trimester lasts 12-14 weeks approximately.

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 Andrea Rodrigo
Andrea Rodrigo
BSc, MSc
Embryologist
Bachelor's Degree in Biotechnology from the Polytechnic University of Valencia. Master's Degree in Biotechnology of Human Assisted Reproduction from the University of Valencia along with the Valencian Infertility Institute (IVI). Postgraduate course in Medical Genetics.
Embryologist. Bachelor's Degree in Biotechnology from the Polytechnic University of Valencia. Master's Degree in Biotechnology of Human Assisted Reproduction from the University of Valencia along with the Valencian Infertility Institute (IVI). Postgraduate course in Medical Genetics.
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