Short cervix in pregnancy raises risk of early birth

Pregnancy can be a time of worry. Many women wonder if a simple check can predict trouble. A new analysis looked at the length of the cervix, the tube that holds the baby inside. This check is done with an ultrasound in the middle of pregnancy. The study looked at 91,404 women who were healthy and carrying one baby. They found a clear link between a shorter cervix and the risk of giving birth too soon. The risk went up as the cervix got shorter. When the length was 20 millimeters, the chance of early birth was much higher than when it was 40 millimeters. At 40 millimeters or more, the chance of a full-term birth was very high. The researchers followed the women for 8.5 months to see who gave birth early. This is an association, meaning the length predicts the risk but does not cause the birth itself. The study did not find safety issues because the test is just an ultrasound. However, the team could not get data for half of all eligible women. They also lacked other risk factors for early birth in some groups. Despite these gaps, the message is clear for expectant parents.