A child who consistently sits at the 5th percentile for weight-for-length and is growing is best described as having which body habitus?

• A. Negative growth pattern
• B. Reflecting a change in growth velocity
• C. Fail to thrive
• D. Thin body habitus

Answer: (D)

Understanding body habitus in children relies on weight-for-length percentiles. A child who consistently sits at the 5th percentile for weight-for-length and continues to grow along that percentile has a lighter build relative to their length but maintains a normal growth trajectory. This pattern describes a thin body habitus.

This fits because the key idea is stability at a low percentile with ongoing growth, not a new decline or a change in growth rate. A negative growth pattern would involve crossing to lower percentiles over time, which isn’t indicated here. A change in growth velocity implies a shift in how fast growth is occurring, not steady growth at a low percentile. Fail to thrive suggests inadequate weight gain or growth failure, whereas this child is growing consistently, albeit at a lighter build.