In a six-month well-child check, where would you measure the chest circumference?

• A. At the armpit
• B. Around the nipple line
• C. Near the shoulder
• D. At the sternum

Answer: (B)

Chest circumference is measured at the nipple line because this central, level site gives a stable and representative reading of the thorax that can be reliably tracked over time. Place a flexible tape around the chest at nipple level, keep it horizontal and snug without squeezing, and have the child breathe normally. Measuring at the armpit, near the shoulder, or at the sternum would not capture the full chest circumference consistently and would lead to unreliable comparisons across visits. So the nipple line is the standard landmark for this measurement.