What is time dilation?
Under the effect of contractions, the cervix opens.
Cervical dilation period includes two phases:
The lag phase, which corresponds to the deletion and early cervical dilation up to 3 cm. It takes about 7 am and 5 am in primiparas in multiparas.
The active phase, which corresponds to the cervical dilation of 4 to 10 cm.
The average length of cervical dilatation is variable.