Normal vaginal delivery (NVD) is the natural culmination of labour, resulting in the birth of the baby through the vagina without surgical intervention. It is a skillful, coordinated process that requires both scientific understanding and gentle hands. Every medical student and future doctor should know the exact steps, not only to assist effectively but also to identify when the process deviates from normal.
Definition
Normal vaginal delivery is the spontaneous delivery of a single, vertex-presenting fetus through the vagina, occurring between 37 and 42 weeks of gestation, with minimal assistance and without complications to the mother or baby.
Pre-Delivery Preparation
1. Environment and Team
- Ensure the labour ward is clean, well-lit, and warm.
- Have a delivery set, sterile gloves, and resuscitation equipment ready.
- The birth attendant, assistant, and neonatal nurse should be present.
2. Maternal Preparation
- Encourage the mother to empty her bladder.
- Clean and drape the perineum aseptically.
- Establish IV access (for fluids or emergency medications).
- Check vital signs and fetal heart rate (FHR).
- Provide psychological reassurance — calmness helps progress labour.
Stages and Steps of Normal Vaginal Delivery
A. First Stage — Cervical Dilatation
- Begins with regular uterine contractions and ends with full dilatation (10 cm).
- Monitor with partograph.
- Encourage upright posture, breathing techniques, and hydration.
- Once the cervix is fully dilated → prepare for delivery.
B. Second Stage — Delivery of the Baby
This is the active stage of childbirth, where the mother pushes the baby out. It has two main phases:
1. Delivery of the Head
- Ask the mother to bear down with each contraction.
- Support the perineum with one hand (guarding it against tears).
- The other hand controls the descent of the head to prevent sudden expulsion (controlled delivery).
- Once the head crowns (largest diameter visible at the vulva), instruct the mother not to push, allowing slow stretching.
- The fetal head then extends to deliver the face and chin.
- Clear the airway — suction the mouth and nose if needed.
- If loose, slip it over the head.
- If tight, clamp and cut it before proceeding.
2. Delivery of the Shoulders
- After restitution (head realigns with shoulders), allow external rotation naturally.
- Place hands on the sides of the head.
- Gentle downward traction delivers the anterior shoulder under the pubic arch.
- Then upward traction delivers the posterior shoulder.
3. Delivery of the Body
- The rest of the baby usually follows smoothly with little effort.
- Support the baby's body as it slides out.
- Hold the baby slightly below the level of the mother's perineum to promote placental blood drainage.
- Note the time of birth.
- Clamp and cut the umbilical cord about 2–3 cm from the umbilicus after it stops pulsating (or immediately if necessary).
- Hand the baby to the neonatal nurse for drying, warming, and initial assessment (Apgar scoring).
C. Third Stage — Delivery of the Placenta
This stage is short but critical — it involves placental separation and expulsion.
Active management is the recommended method:
Steps:
- Administer 10 IU oxytocin IM immediately after birth of the anterior shoulder or baby (within 1 minute).
- Perform controlled cord traction (Brandt–Andrews method) while supporting the uterus suprapubically.
- Once placenta appears, twist membranes gently to deliver them intact.
- Massage the uterus firmly to ensure it is well contracted.
D. Fourth Stage — Immediate Postpartum Period (First 1 Hour)
This is the period of close observation for early detection of complications like postpartum hemorrhage (PPH).
Monitor:
- Maternal pulse, BP, and uterine tone every 15 minutes.
- Check vaginal bleeding.
- Examine the placenta to ensure it's complete (no retained cotyledons).
- Inspect the perineum and repair any tears or episiotomy.
- Encourage early skin-to-skin contact and initiation of breastfeeding.
Mechanisms Supporting Normal Delivery
During a normal vaginal delivery, the fetal head performs a series of cardinal movements (engagement → descent → flexion → internal rotation → extension → external rotation → expulsion).
These movements ensure the baby aligns optimally with the maternal pelvis for safe passage.
Complications to Watch For
Even in normal labour, vigilance is essential.
- Perineal tears
- Fetal distress
- Prolonged second stage
- Retained placenta
- Postpartum hemorrhage
Prompt recognition prevents morbidity.
Summary (High-Yield Points)
- NVD = spontaneous vaginal birth of a single, vertex fetus between 37–42 weeks.
- Key stages: Delivery of head → shoulders → body → placenta.
- Active management of 3rd stage prevents postpartum hemorrhage.
- Oxytocin 10 IU IM after birth of baby = gold standard.
- Guard perineum, support head, check for nuchal cord, and ensure uterine contraction post-delivery.
- Always monitor mother and baby closely in the immediate postpartum period.