CDC Infant Growth Chart Calculator (0–36 Months)
CDC 2000 infant growth reference for weight, length, and head circumference from birth to 36 months. Optional corrected age for infants born preterm.
How to interpret CDC infant growth percentiles
CDC 2000 infant charts convert weight, length, and head circumference into z-scores and percentiles for age and sex. A z-score of 0 is the 50th percentile. Values below −2 or above +2 generally warrant review with serial measurements and the clinical picture—not a single-point diagnosis.
For preterm infants after discharge, enter weeks born early to apply corrected age. In the NICU, use Fenton preterm growth by postmenstrual age rather than CDC infant charts.
CDC vs WHO for infants
AAP guidance commonly uses WHO Child Growth Standards from birth to 24 months and CDC charts from 2 to 20 years. Some U.S. practices plot CDC infant charts through 36 months. Compare with the WHO infant calculator (0–24 months) and stay consistent across visits.
Sources and Reference Basis
CDC 2000 infant growth LMS data for weight, length, and head circumference 0–36 months. Use for bedside screening; confirm unusual values with serial measurements.
- CDC Growth Charts Primary U.S. reference for infant and child growth.
- WHO Child Growth Standards Alternative infant standard; see WHO 0–24 month calculator.
- CDC growth (2–20 years) Older children and adolescents.
Related
Frequently Asked Questions
What ages does this CDC infant calculator cover?
Birth through 36 months for weight, length, and head circumference using CDC 2000 infant reference data.
Should I use corrected age?
For infants born preterm, corrected age (subtract weeks born early from chronological age) is often used when plotting against term infant charts after discharge.
CDC or WHO for a 6-month-old?
AAP guidance commonly prefers WHO through 24 months. Some practices use CDC infant charts; stay consistent with your clinic policy.