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A typical pregnancy lasts 40 weeks from the first day of your last menstrual period (LMP) to the birth of the baby.
Some of the changes you experience in your first trimester may cause you to revise your daily routine. At the end of 8 weeks, your baby is a fetus, and is nearly 1 inch long, weighing less than ⅛ of an ounce. Your baby is covered by fine, feathery hair called lanugo and a waxy protective coating called vernix. Now halfway through your pregnancy, your baby is about 6 inches long and weighs about 9 ounces. Average birth weight is between 6 pounds, 2 ounces to 9 pounds, 2 ounces and average length is 19 to 21 inches long.
It is divided into three stages, called trimesters: first trimester, second trimester, and third trimester.
The second trimester is weeks 13 to 27, and the third trimester starts about 28 weeks and lasts until birth.
If your baby is a girl, her uterus and ovaries are in place, and a lifetime supply of eggs has formed in the ovaries. Discomforts that started in the second trimester will likely continue, along with some new ones. As your due date approaches, your cervix becomes thinner and softer in a process called effacing that helps the birth canal (vagina) to open during childbirth.
Most full-term babies fall within these ranges, but healthy babies come in many different weights and sizes.
It is intended for general informational purposes only and does not address individual circumstances.
This slide show will discuss what occurs to both the mother and baby during each trimester.
As the baby grows and puts more pressure on your internal organs, you may find you have difficulty breathing and have to urinate more frequently. Your doctor will monitor the progress of your pregnancy with regular exams, especially as you near your due date. It is not a substitute for professional medical advice, diagnosis or treatment and should not be relied on to make decisions about your health. Each pregnancy is different and even if you've been pregnant before you may feel completely different with each subsequent pregnancy. Never ignore professional medical advice in seeking treatment because of something you have read on the MedicineNet Site.
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