A woman's body goes through a lot of changes during pregnancy. The first trimester is a time of rapid development for the baby and a lot of internal changes for the mother. Some women experience severe symptoms that last for months, while others have none at all. The first trimester is vital because all the baby's major body systems are beginning to form.
A woman's body does not change much on the outside during the first trimester, but plenty is changing inside. As the embryo implants into the wall of the uterus, growth and development happen rapidly. A lot of major changes happen for the mother in the first trimester. They're just not visible.
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