Pregnancy by Trimester

Posted: Jan. 1, 2004

FIRST SEMESTER

Changes in Your Body
During the first three months of pregnancy, or the first trimester, your body is undergoing many changes. As your body adjusts to the growing baby, you may have nausea, fatigue, backaches, mood swings, and stress. Just remember that these things are normal during pregnancy, as your body changes. Most of these discomforts will go away as your pregnancy progresses. And some women might not have any discomforts! If you have been pregnant before, you might feel differently with this pregnancy. Just as each woman is different, so is each pregnancy. And, as your body changes, you might need to make changes to your normal, everyday routine.

Changes in Your Baby
By the end of this trimester, your baby is about three inches long and weighs about half an ounce. The eyes move closer together into their positions, and the ears also are in position. The liver is making bile, and the kidneys are secreting urine into the bladder. Even though you can't feel your baby move yet, your baby will move inside you in response to pushing on your abdomen.


SECOND TRIMESTER

Changes in Your Body
Most women find the second trimester of pregnancy to be easier than the first trimester, but it is important to stay informed about your pregnancy in this stage too. While you might notice that symptoms like nausea and fatigue are going away, you will see other new, more noticeable changes to your body. Your abdomen will expand as you gain weight and the baby continues to grow. And before this trimester is over, you will feel your baby beginning to move! Many of the other symptoms you had in the first trimester might also continue, like constipation or leg cramps, so it is important to keep doing all of the healthy things you have already learned to help prevent or treat those symptoms.

Changes in Your Baby
By the 26th week, your baby will weigh about 1 3⁄4 pounds and be about 13 inches long. With this growth comes the development of your baby's features, including fingers, toes, eyelashes, and eyebrows. Around the fifth month, you might feel your baby move! By the end of this trimester, all of your baby's essential organs like the heart, lungs, and kidneys are formed.


THIRD TRIMESTER

You’re almost there! In a few short months you will be holding your new baby in your arms.

Changes in Your Body
You could still be having some of the same discomforts you had in your second trimester, but now you will notice that you may have to go to the bathroom more often or that you find it even harder to breathe. This is because the baby is getting bigger and it is putting more pressure on your organs. Don't worry, your baby is fine and these problems will lessen once you give birth.

Changes in Your Baby
Your baby is still growing and moving, but now it has less room in your uterus. Because of this, you might not feel the kicks and movements as much as you did in the second trimester. During this final stage of your pregnancy, your baby is continuing to grow. Even before your baby is born it will be able to open and close its eyes and might even suck its thumb.

As your body starts to prepare for the birth, your baby will start to move into its birth position. You might notice the baby "dropping," or moving down lower in your abdomen. This can reduce the pressure on your lungs and rib cage, making it easier to breathe or not to get out of breath so fast. As you near your due date, your cervix becomes thinner and softer (called effacing). This is a normal, natural process that helps the birth canal (vagina) to open during the birthing process. Your health care provider can check your progress with a vaginal exam.

And, your visits to your provider may increase the month before you give birth. The average baby is about 20 to 22 inches long and weighs approximately 7 1/2 pounds at birth, but anywhere between 5 lbs., 11 1/2 ounces and 8 lbs., 5 3/4 ounces is a healthy range for newborns.

Source: Health and Human Services Office of Women’s Health/National Women’s Health Information Center

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