What is the landmark to measure an infant's chest circumference?

• A. The clavicle line
• B. The nipple line
• C. The umbilical line
• D. The midaxillary line

Answer: (B)

When measuring an infant’s chest circumference, use the nipple line as your landmark. Place a flexible tape measure around the chest at the level of the nipples, keeping it horizontal and snug but not tight. This location gives a consistent cross-sectional size of the chest that reflects thoracic growth over time. Other landmarks would measure different areas (for example, near the clavicle area would assess a higher part of the chest, the umbilical line targets the abdomen, and the midaxillary line runs along the side), leading to inconsistent or non-representative results. So the nipple line provides the standard, reliable reference for chest circumference.