When does the external rotation of a newborn usually occur in the birth process?

BTSC Staff Nurse 1 August-2025

Obstetrics & Gynaecology

Easy

Appeared in: BTSC Staff Nurse 1 August-2025

Explanation

The correct option describes that external rotation occurs after the head is born but before the delivery of the shoulders.
This movement, also called restitution, involves the fetal head rotating back to its original position in alignment with the fetal back and shoulders.
This rotation is necessary for the shoulders to align with the anteroposterior diameter of the pelvic outlet, which is the largest diameter, facilitating their passage.
As described in Williams Obstetrics, after the head is delivered, it undergoes restitution, which aligns the shoulders for delivery, followed by the expulsion of the rest of the body.

Option A: This is incorrect. The delivery of the entire baby is the final step, known as expulsion, which occurs after external rotation and the delivery of the shoulders.
Option B: This is incorrect. Engagement is one of the first cardinal movements, where the fetal head enters the pelvic inlet. External rotation happens much later in the process.
Option C: This is incorrect. Internal rotation happens before the head is delivered. It is followed by extension and crowning, which result in the birth of the head. External rotation occurs only after the head is completely out.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain The concept tested is the sequence of the cardinal movements of labor, specifically the timing of external rotation (restitution) as background academic context rather than a clinical decision trigger.
Understanding the cardinal movements of labor is fundamental for nurses and midwives to accurately assess labor progress and identify abnormalities.
Failure of the head to undergo spontaneous external rotation after delivery is a key warning sign of shoulder dystocia, an obstetric emergency where the anterior shoulder is impacted behind the pubic symphysis.
A nurse observing the absence of restitution should immediately alert the provider and prepare for shoulder dystocia maneuvers, such as the McRoberts maneuver and suprapubic pressure.

How to Approach the Question

This is a process-based recall question that tests your knowledge of the sequence of events in childbirth.
First, identify the core concept being asked: the timing of 'external rotation' within the birth process.
Recall or visualize the seven cardinal movements of labor in their correct order: Engagement, Descent, Flexion, Internal Rotation, Extension, External Rotation, and Expulsion.
Locate 'External Rotation' in this sequence. It occurs after 'Extension' (the delivery of the head) and before 'Expulsion' (the delivery of the shoulders and body).
Evaluate each option against this established sequence. Option A is too late, Option B is too early, and Option C describes events that happen before the head is even born.
Select the option that accurately places external rotation after the head is delivered but before the shoulders emerge.

Concept Tested & Keywords

Concept Tested: The concept tested is the sequence of the cardinal movements of labor, specifically the timing of external rotation (restitution).
Stem keywords: external rotation, newborn, birth process
Lead-in keywords: When does

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E6 Obstetrics Williams pp. 20-38, 27-45