Final Answer:
Regarding the anterior fontanel of a full-term neonate, options 2) Approximately 2.5-4 cm in size and 3) Diamond shape are true.
Step-by-step explanation:
The anterior fontanel is a soft spot on a baby's skull formed by the intersection of several skull bones. Option 2 is correct as the typical size of the anterior fontanel in a full-term neonate is approximately 2.5-4 cm. This fontanel is larger than the posterior fontanel and gradually closes as the baby grows.
Option 3 is also accurate as the anterior fontanel is commonly described as diamond-shaped. The shape is a result of the sutures between the frontal and parietal bones. The diamond shape is a distinguishing feature that healthcare professionals often use to assess the normal development of a newborn's skull.
Options B and C are true.