If a child crosses two major percentile bands downward on a growth chart, what is most concerning?

• A. Potential growth problem requiring evaluation
• B. Temporary slowing growth due to minor illness
• C. Normal variation
• D. Measurement error due to attire

Answer: (A)

Crossing two major percentile bands downward signals a real change in growth velocity that should not be ignored. Growth charts track how a child’s height or weight compares to peers over time, and moving across two large percentile steps indicates a sustained drop in growth that isn’t typical for normal variation. This pattern can point to potential problems such as insufficient nutrition, chronic illness, malabsorption, endocrinologic issues, or other conditions affecting growth. While a minor illness or measurement quirks can cause small fluctuations, they rarely produce a downward shift across two large percentile bands that doesn’t quickly recover. Because it highlights a possible underlying growth problem, it warrants a thorough evaluation to identify any treatable causes and intervene appropriately.