The Four Stages of Labour Explained

Labour is typically described in four stages, each with distinct physiological changes and monitoring priorities.

First stage: onset to full dilation

The first stage runs from the start of regular contractions until the cervix is fully dilated to 10 cm. This is usually the longest stage, and progress is tracked using a partograph, which helps identify slow or obstructed labour early enough to act.

Second stage: full dilation to birth

The second stage covers the actual delivery of the baby. Close monitoring of fetal heart rate is essential here, since a normal fetal heart rate sits between 110 and 160 beats per minute, and deviations can signal fetal distress.

Third stage: delivery of the placenta

The third stage is the delivery of the placenta, and active management (a uterotonic given within one minute of the baby's birth, controlled cord traction, and uterine massage) significantly reduces the risk of postpartum haemorrhage compared to waiting for the placenta to deliver on its own.

Fourth stage: the first hours after birth

The fourth stage covers the immediate postpartum period, when the mother is monitored closely for bleeding, and the newborn is dried, stimulated, and encouraged toward the first breastfeed, ideally within the first hour of life.

Why this framework matters

Knowing which stage a labouring woman is in tells you what to monitor, what complications are most likely, and what interventions are appropriate, which is exactly why it comes up so often in licensing exams.

This guide is for educational revision only. Always follow your national curriculum, workplace protocols and official clinical guidelines.