When comparing the anterior and posterior fontanelles of a newborn, the nurse knows that both:

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The anterior and posterior fontanelles allow for molding of the newborn's head during birth, accommodating passage through the birth canal. The anterior fontanelle is larger and closes later (around 18-24 months) compared to the posterior fontanelle, which typically closes by 1-2 months after birth. Fontanelles are not used to identify station in labor, which refers to the baby's position relative to the ischial spines of the mother's pelvis.

When Comparing the Anterior and Posterior Fontanelles of a Newborn