Some people also talk about a fourth trimester , which is the 3-month transitional period after delivery. The first trimester is the first 12 weeks of the pregnancy, and it is a crucial time for fetal development.
At conception, the egg and sperm combine to form a zygote, which implants in the wall of the uterus. The zygote becomes an embryo as its cells divide and grow. By the end of the first 12 weeks :. These include :. Morning sickness can last throughout the first trimester and sometimes beyond.
Despite its name, it does not occur only in the morning. Weeks 14—27 are the second trimester. The fetus goes through many changes during this time, growing to be around 1 foot long and weighing 1. Many people feel more comfortable during the second trimester of pregnancy.
Morning sickness and fatigue often reduce or disappear. The third trimester lasts from week 29 until delivery, which is usually around week Check back every week of your pregnancy to see how your baby is developing and to find out what changes you can expect in your own body, too! Reviewed by: KidsHealth Medical Experts. Larger text size Large text size Regular text size. A Word About Due Dates and Trimesters After you announce your pregnancy, the first question you'll probably be asked is "When are you due?
Childbirth classes are designed to prepare you and your partner for labor and delivery. Your due date is really an estimated date of delivery EDD. The dating system works well for those who have fairly regular menstrual cycles.
However, for those who have irregular periods , the dating system may not work. If the date of your last menstrual period is uncertain, other methods may be needed to determine the EDD.
The next most accurate method of determining the due date is an ultrasound in the first trimester, because early fetal development is fairly regular across pregnancies. Pregnancy is a time unlike any other in your life. Babies born to people who receive regular prenatal care have much better outcomes. A stroke can be life-threatening, so it's important to act fast. If you think a loved one is having a stroke, here's what you should and shouldn't do.
The positions of your baby in the womb becomes important as your due date approaches because they should be in the best position for delivery. As your…. Swollen feet during pregnancy is very common, but that doesn't mean you have to be uncomfortable.
We'll cover some effective ways to deal with the…. If you're experiencing changes to your dreams since your pregnancy began, you aren't alone. Learn more about what the causes may be, what types of…. What are the telltale early symptoms of pregnancy?
Every person is different, but here are a few top signs. A new study finds that epidurals do not affect child development in their later years. A fetal arrhythmia is an irregular heart rate — too fast, too slow, or otherwise outside the norm. Medically Reviewed by James Greenberg, M. Medical Review Policy All What to Expect content that addresses health or safety is medically reviewed by a team of vetted health professionals.
You can hardly wait until your due date — but when is it again? Find out exactly how many weeks and months into pregnancy you are. Back to Top.
In This Article. Continue Reading Below. More About Pregnancy Trimesters. Your Guide to the First Trimester of Pregnancy. Your Guide to the Second Trimester of Pregnancy. Your Guide to the Third Trimester of Pregnancy.
How to Calculate Your Due Date. View Sources. March of Dimes, What is Full Term?
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