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NORMAL LABOR

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STAGES OF NORMAL LABOUR

Normal Labour is the process of expulsion of a mature fetus with the placenta and membranes in a labor which is spontaneous and uncomplicated. It is divided into three stages:

Stage I : Stage I lasts from the onset of labour to full dilation of the cervix. In a woman in her first pregnancy, this stage lasts for about 10 to 12 hours. In a woman who has delivered earlier, it lasts from 6 to 8 hours.

The First Stage is again divided into three phases:

  • Phase I: This is the longest and least painful phase of the entire duration of labour. It starts from the time when the cervix first starts to dilate to the time when the cervix is 4 cm dilated. It is also called the 'Latent phase' of labour or the 'Early phase' of labour. It can last for days and can occur with only the mildest discomfort to the pregnant woman.

Stages of Labor

  • Phase II: This is a more active phase of labour. The cervix dilates from 4 cm to 8 cm during this phase. The contractions are more painful , of longer duration and come more regularly. It is also called the 'middle phase ' of labour.

  • Phase III: During this phase, the cervix dilates from 8 cm to 10 cm . At 10 cms, the cervix is fully dilated and the baby's head can come out of the uterus safely and easily. This phase is also called the 'transition phase' of labour since it marks the transition of the First stage of labour to the Second stage.

Stage II : Stage II lasts from the full dilatation of the cervix to the expulsion of the baby. In a first pregnancy, it lasts for about 1- 2 hour, in subsequent pregnancies, it lasts for about ½ hour.

This stage (Second stage) is a stage when the baby's head is travelling down the vaginal canal to be delivered. The contractions are very painful and run into each other, appearing to produce almost continuous pain.

Stage III : Stage III lasts from the birth of the baby to the expulsion of the placenta and the membranes. It lasts for about 15 - 20 minutes in both first and later pregnancies. The third stage is comparatively less painful and is characterised by a gush of bleeding at the time the placenta separates from the uterus.

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