Use of a stadiometer, an instrument specifically designed for height measurements, is preferred. However, accurate measurements may be obtained by using a graduated ruler or tape attached to a wall and placing a flat-surfaced object horizontally on top of the child's head. Spring-type scales are not sufficiently accurate for this use. Check the scale before each use to ensure that it is zeroed. The infant or child should wear only a dry diaper or light undergarment while being weighed.
Check scales regularly for accuracy, and make an effort to use the same scale on subsequent visits.
Tighten the tape to compress the hair. Interpret measurements within the context of the individual child's family and growth history. If a child's measurements fall within the 10th through 25th percentile range or the 75th through 90th percentile range, assess past growth patterns and genetic and environmental factors to determine if follow-up is necessary. Recheck measurements that are below the 5th percentile or above the 95th percentile. If these measurements are confirmed, further medical evaluations may be needed.