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1.
January 2019

FAQ087, January 2019

What is preterm labor? Preterm labor is defined as regular contractions of the uterus resulting in changes in the cervix that start before 37 weeks of pregnancy. Changes in the cervix include effacement (the cervix thins out) and dilation (the cervix opens so that the fetus can enter the birth canal). In some cases preterm labor can lead to a baby being born too soon.


2.
January 2019

FAQ188, January 2019

How does multiple pregnancy occur? A pregnancy with more than one fetus is called multiple pregnancy. If more than one egg is released during the menstrual cycle and each is fertilized by a sperm, more than one embryo may implant and grow in your uterus. This type of pregnancy results in fraternal twins (or more). When a single fertilized egg splits, it results in multiple identical embryos. This type of pregnancy results in identical twins (or more). Identical twins are less common than fraternal twins.


3.
January 2019

FAQ079, January 2019

What does it mean when a fetus is breech? In the last weeks of pregnancy, a fetus usually moves so his or her head is positioned to come out of the vagina first during birth. This is called a vertex presentation. A breech presentation occurs when the fetus’s buttocks, feet, or both are in place to come out first during birth. This happens in 3–4% of full-term births.


American College of Obstetricians and Gynecologists
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