When plotting a 20-week-old infant's weight on a standardized growth chart, the weight is between the 2nd and 3rd percentile. What is the appropriate next step?

• A. Compare this weight with previous weights recorded in the child's chart.
• B. Refer for metabolic testing.
• C. Evaluate the parent's body build in relation to the infant's weight.
• D. Obtain a 24-hour nutritional history before making any conclusions.

Answer: (B)

Growth assessment hinges on pattern over time, not a single measurement. When an infant’s weight sits around the 2nd to 3rd percentile at one visit, the first and most important step is to look at past measurements to see the trajectory. If the child has consistently followed a similar percentile or shows steady, appropriate weight gain with normal length growth, this finding can reflect normal variation and no immediate cause for concern.

If there’s a downward shift across percentiles or a recent drop in weight with poor gain, that signals possible growth faltering and triggers a fuller evaluation. This would include a thorough nutritional history, feeding patterns, and a complete physical examination. Only if growth faltering is confirmed or red flags appear would you pursue more targeted testing, such as metabolic investigations, rather than starting with metabolic testing from a single data point.