NICU · Growth Assessment
Fenton Growth Chart (2025)
Classify size at birth (SGA / AGA / LGA) using the exact published Fenton 2025 third-generation weight cutoffs (22–42 weeks), plus length and head circumference percentile estimates.
Patient
Gestational age at measurement
Weight
Length (optional)
Head circumference (optional)
About Fenton 2025
The Fenton third-generation growth charts (2025) are a 15-country meta-analysis restricted to preterm infants without abnormal fetal growth, improving on the 2013 version. The weight-at-birth cutoffs (3rd/10th/90th percentile, 22–42 weeks) used here are the exact published values from Fenton, Elmrayed & Alshaikh (2025), Paediatr Perinat Epidemiol, DOI: 10.1111/ppe.70035.
Length and head circumference are not yet digitized as exact percentile tables (the 2025 paper publishes them as chart curves, not a data table); those two are estimated using 2013 Fenton reference medians with an assumed distribution — see the method note below.
Enter gestational age and at least weight to calculate percentiles.
Exact 2025 published cutoffs at this GA. Classification is exact; the percentile shown is linearly interpolated between P3/P10/P90 and is approximate.
Method note — length & HC only: these two are estimated from 2013 Fenton reference medians using a normal-distribution approximation (assumed ~5% CV for length, ~4% for HC), not the 2025 update. This tracks the published curves reasonably in the mid-range but can diverge near the tails (<P3 or >P97). Weight above uses the exact 2025 published cutoffs.
Clinical decision support only. Weight classification uses the exact published 3rd/10th/90th percentile size-at-birth cutoffs (22–42 weeks) from Fenton TR, Elmrayed S, Alshaikh BN. "Fenton third-generation growth charts of preterm infants without abnormal fetal growth: a systematic review and meta-analysis." Paediatr Perinat Epidemiol. 2025. DOI: 10.1111/ppe.70035. Source data: University of Calgary / FentonGrowth.ca, published under CC BY-NC-ND 4.0 — reproduced here with attribution for a free clinical tool; contact the authors for other reuse. Length and head circumference are estimated from the earlier 2013 reference (not yet available as an exact 2025 table). For high-stakes or borderline classification, confirm against the official chart at FentonGrowth.ca. PediaSuite is not affiliated with the chart's authors or the University of Calgary.
Reviewed by C. A. Leyva, MD, neonatologist · Last reviewed September 2026
References
- Fenton TR, Elmrayed S, Alshaikh BN. Fenton third-generation growth charts of preterm infants without abnormal fetal growth: a systematic review and meta-analysis. Paediatr Perinat Epidemiol. 2025;39(6):543–555. doi:10.1111/ppe.70035
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