The first stage of labour is characterized by

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The first stage of labour is marked by the dilation of the cervix, which is the opening of the uterus. This stage can last for a few hours to even a few days before moving on to the second stage where the baby is born. Lightening (when the baby drops lower into the pelvis) and crowning (when the baby's head can be seen at the vaginal opening) occur during the later stages of the first stage. The delivery of the placenta occurs during the third and final stage of labour.

The First Stage of Labour Is Characterized by