Please edit this paragraph to be less complex.
A pregnancy that ends before 37 weeks of gestation resulting in a live-born infant is a " premature birth " or a " preterm birth ".
A pregnancy that ends this way, but that is between 20 and 37 weeks old is known as " premature birth " if the baby is born alive. <SEP> A pregnancy that ends without a child being born also may cause some problems to the woman this happens to.