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BETTER MATERNITY HOW YOUR BODY CHANGES the foetus from infection, injury and egg is fused with sperm, there is an One of the most critical structures intricate change in the balance of your formed during early pregnancy is the and allows the conditions in the uterus to become ready for the growth of the foetus; the lining of your uterus (endometrium), rather than being discharged, thickens and enables the development of the baby. Your uterus which was previously about the size of a fist, begins to expand as the embryo grows. The uterus is divided into. two main sections - the body and the cervix. The body of the uterus is where the foetus grows, while the cervix remains tightly closed during pregnancy to prevent miscarriage. At first the germinal stage is a collection of embryonic cells no bigger than a pinhead. THE FIRST TRIMESTER (WEEKS 1 TO 12) During this first trimester many demands are put on your body due to the changes in your hormones and body transformations so you may be prone to mood changes and experience some nausea, tiredness and enlargement of your breasts. The amniotic sac forms shortly after conception. This amniotic sac also known as the “bag of water” which is made up mostly of water from your body protects baby with nutrients, oxygen, water, antibodies and a waste removal system. This essential new organ is made up of three layers of membranes, blood vessels and other tissues attaches to the uterine wall and is connected to the foetus by the umbilical cord. Three blood vessels radiate out from the umbilical cord and penetrate the placenta. Two carry carbon dioxide and waste from the foetus, the other supplies oxygen and nutrients from you. THE SECOND TRIMESTER (WEEKS 13 TO 26) During the second trimester there is a period of rapid growth with development for both the foetus and your body. The placenta continues to grow along with the uterus throughout this trimester. The foetus limbs and facial features become more defined, and fine details like fingerprints and hair begin to form. The foetus also begins moving, though you may not feel it until around week 20. By the end of the second trimester, the foetus has developed most of its internal organs, though they are still maturing. As the foetus grows, your uterus enlarges significantly. The hormone progesterone continues to support your
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