How long is the normal pregnancy?

The normal range of cervical length during pregnancy is usually 3 cm or more.

Cervical length is relatively stable in the early and middle stages of pregnancy and generally remains within the normal range. If the cervical length is too short during this stage, it may indicate a certain risk. When the cervical length is significantly less than 3 cm, especially with cervical dilation, the probability of premature birth may increase.

Regular monitoring of cervical length, such as ultrasound, can detect potential problems in time for appropriate intervention. For pregnant women at risk of cervical shortening, doctors may recommend close observation, rest and even certain medical measures to prevent premature birth.