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Pregnancy trimesters: A guide

The FASD Prevention Conversation Project

The typical pregnancy has three trimesters and lasts around 40 weeks from the first day of a woman’s last period. In each trimester, the fetus will meet specific developmental milestones.

While 40 weeks is the usual time frame, a full-term baby can be born as early as 37 weeks and as late as 42 weeks.

Read on for more information about what to expect during each pregnancy trimester.

Pregnancy trimester infographic <br>Image credit: Stephen Kelly, 2018</br>

Image credit: Stephen Kelly, 2018

The first trimester

The first trimester lasts for the first 12 weeks of the pregnancy and is crucial for the baby’s development. At conception, the egg and sperm combine to form a zygote, which will implant in the uterine wall.

The zygote becomes an embryo as the cells divide and grow. All of the major organs and structures begin to form.

At 4–5 weeks, the embryo is only 0.04 inches long but will grow to around 3…

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