Which measurement is routinely taken in the first 2 years of life?

• A. Head circumference
• B. Blood pressure
• C. Cholesterol
• D. Body mass index

Answer: (A)

Head circumference is routinely measured in the first two years because brain growth happens rapidly during this period, and the skull expands as the brain grows. Regularly measuring the head size and plotting it on a growth chart lets clinicians detect abnormal patterns early, such as microcephaly or macrocephaly, which can signal underlying problems needing evaluation. This measurement sits alongside other growth checks to monitor how the brain is developing over time.

The other options aren’t standard screening tools in infancy. Blood pressure screening generally starts around age three; cholesterol testing isn’t routinely done in healthy infants; and body mass index isn’t used for children under two—growth is tracked with weight and length, with head size added to specifically monitor brain growth.