CDC/NCHS Infant Weight for Length Percentiles (< 36 months)

Input:
Sex Female

Male
Length
Weight
Results:
Z Score  
Percentile  
 
Decimal Precision:
Weight for Length Percentile Interpretation
Percentile < 5:Underweight
Percentile >= 5 and < 95:Healthy weight
Percentile >= 95:Overweight
  • This calculator uses measured recumbent Length for infants and toddlers from birth through 36 months of age.
  • It is not valid for standing height.
  • At the extremes (> 97th percentile or < 3rd percentile), small differences in percentiles represent clinically important differences in weight/height. At these extremes, the z-score is a more precise reflection of how far the measurement deviates from the mean, and is a useful tool for tracking changes.
Examples
 
Z-scorePercentile equivalent
- 3.00.3
- 2.02.5
+ 2.097.5
+ 3.099.7

 
  1. Percentile conversion from Z-Score is done by table look-up in the standard Normal Table. Percentiles are provided for Z Scores between -3.09 and 3.09. Values beyond these extremes return percentiles of 0.1 and 99.9 respectively.
  2. LMS Parameters for Girls: Infant Weight for Length . National health and nutrition survey (NHANES), CDC/National Center for Health Statistics.
  3. LMS Parameters for Boys: Infant Weight for Length . National health and nutrition survey (NHANES), CDC/National Center for Health Statistics.
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