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- And that, is how fertilization works.
- Currently, however, we are still in the first trimester. The first trimester lasts from the last period until week 12.
- During the first trimester, all tissues, organs and systems begin to develop. The placenta starts to develop as well. At the end of eight weeks, the embryo will be called a fetus. Gastrulation happens during this period of time.
- The second trimester is a period of rapid growth. The tissues of the fetus becomes more specialized and begins to function. Now, the heart is larger and can be heard by a stethoscope; the early skeleton also starts to form. Lanugo also starts growing.
- And by the third trimester, the fetus' organs start to mature and prepare for the outside world. It completes is development.
- Then finally, after approximately nine months, the fetus is ready for birth. Normal birth occurs in three stages: dilation, expulsion and the placental stage.
- And that where babies are from. In fact, it is where all life on earth, including you and me, comes from!
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