What Happens During the Trimesters of Pregnancy?

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When a woman is pregnant, her body goes through many changes. The changes that she experiences during pregnancy are divided into different sections of her pregnancy or trimesters. During each trimester, doctors look for different things and the baby develops in different ways.

While you are traveling through your pregnancy, it is important to understand what you should expect during these different trimesters so that you can watch for any danger signs or issues that may occur. Below is more information regarding the different trimesters and the different changes that your baby goes through during each.

1. First Trimester

The first trimester takes of the first 13 weeks of your pregnancy. This is also the time when many women experience the most severe of the symptoms that are usually associated with pregnancy. Morning sickness is extremely common and may begin to dissipate after the first trimester has concluded.


Your baby will also begin to go through many changes during this time as they grow from a tiny organism with just a few cells to around 8 to 9 cm in length. By the end of this first trimester, you should also be able to determine what gender your baby is if this is something you’re interested in.

2. Second Trimester

The second trimester, which includes weeks 14 through 26, is usually the trimester that pregnant women enjoy the most. It is at this time of morning sickness and fatigue began to lift and women will begin to get their energy back.


This is also the trimester where you will begin to physically see the signs of pregnancy, such as the swelling stomach and swollen breasts. Some symptoms that go along with this trimester are fuzziness, headaches, and water retention. You should keep your doctor informed of your symptoms after doctor’s appointments.

During this trimester, your baby’s bones will begin to harden and their ears will begin looking like ears. You will also begin feeling your baby move around and they will develop their own sleeping patterns.

3. Third Trimester

The third trimester will take up the remainder of your pregnancy. During this trimester you will experience all the emotions that are typical when preparing to become a parent. For example, you may begin to feel nervous and excited about the coming of the baby.

As your baby will grow tremendously during this time and it will begin to press on organs and other areas in the body and that make the pregnant woman more uncomfortable. When you reach your third trimester, you’ll begin visiting your doctor every two weeks. By the end of your third trimester this will increase to once a week through the end of your pregnancy.


Your baby will continue to grow until all the vital organs have been completely formed and are ready to be used outside of the womb. Another change to your baby will be that they move into position so that they are ready for the delivery process.

It is important to remember that during this portion of your pregnancy, you are likely to have some balance issues due to the size of your service. You should also make sure that your bag is ready for the hospital so that there will be no delays when it is time for you to give birth.

4. Conclusion

During each trimester, it is very important that you take care of your body so that you can have a healthy pregnancy. You should make sure that you are taking your prenatal vitamins and following the directions that your doctor has given you.

You should also maintain a healthy diet and exercise program as well as works the way that you gain throughout your pregnancy. By this time you reach the end of your pregnancy, you will have gained between 25 and 35 pounds, depending on certain circumstances that were present before you became pregnant.


It is important that you gain the proper amount of weight while you’re pregnant because this could lead to issues and complications for you and your baby. Your doctor will be able to monitor your weight gain throughout your pregnancy and will help guide you in the right direction.

Each trimester brings new and exciting experiences to the woman who is pregnant. While each trimester has its own challenges and discomforts the joy of becoming a mother will erase your memory of those items after you have given birth.

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Dr. Lynette Weiss, MD

Dr. Lynette Weiss is ConceiveEasy's Senior Physician and Scientific Director. She is certified in Obstetrics and Gynecology by the American Board of Obstetrics and Gynecology and is a fellow of the American College of Obstetrics and Gynecology.