While a woman is pregnant she will hear the term “trimester” in reference to the stages she will go through in her pregnancy. A trimester is approximately three months. There are three trimesters that comprise the entire pregnancy, which lasts a total of 40 weeks, from the point of conception. As the pregnancy continues, a physician can monitor the growth of the baby during the trimester.
While the baby is growing during the first week, it is called an embryo. This is a key time for the woman to ask her doctor about taking supplements such as folic acid. After week 9 it is known as a fetus. During the first trimester, the baby will start to grow the basic rudimentary forms of the lungs, heart and central nervous system.
Within the second trimester of the pregnancy calendar, the growth of the fetus continues. The second trimester is when a woman should start to feel the baby kicking. Depending on the size of the fetus, it can average around seven inches long. An ultrasound will be able to confirm the exact length and growth of the baby.
The last trimester starts from week 27 to the time the baby is born. The mother should now normally feel the baby kicking. As a result of her hormones and the weight of the baby, she can experience backaches, tiredness and problems sleeping. The baby will continue to grow during this time. Therefore, a baby might experience a growth spurt in preparation for birth, and can average up to 20 inches when born.






