When comparing the anterior and posterior fontanelles of a newborn, the nurse knows that both:
1. Are approximately the same size.
2. Close within 12 months of birth.
3. Are used in labor to identify station.
4. Allow for molding of the head.
4
Rationale 1: The anterior fontanelle measures approximately 2–3 cm. The posterior fontanelle is much smaller.
Rationale 2: The anterior fontanelle closes around the 18th month. The posterior fontanelle closes between 8 and 12 weeks after birth.
Rationale 3: In labor, the presenting part, not the fontanelles, is used to identify station.
Rationale 4: The anterior fontanelle measures approximately 2–3 cm, and closes around the 18th month. The posterior fontanelle is much smaller, and closes between 8 and 12 weeks after birth.
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