A mother brings her newborn in for an assessment and asks. "Is there something wrong with my baby? His head seems so big." Which statement is true regarding the relative proportions of the head and trunk of the newborn?

A. Head circumference should be greater than chest circumference at birth is correct. In a newborn, the head is typically larger than the chest circumference, which is normal due to the large size of the brain relative to the rest of the body at birth. B. When the anterior fontanel closes at 2 months, the head will be more proportioned to the body is incorrect. The anterior fontanel typically closes between 12 to 18 months, not 2 months, and the head size gradually becomes more proportionate as the child grows. C. At birth, the head is one fifth the total length is inaccurate. The head is about one-quarter of the newborn's total length, not one-fifth. D. The head size reaches 90% of its final size when the child is 3 years old is inaccurate. The head reaches approximately 80-85% of its final size by age 2, not 3.