Birthweight Percentile

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Calculate birthweight percentile adjusted for gestational age.

Neonatal Data

Birth Weight

Weeks

Days

Infant Sex

Growth Assessment

Percentile66.8th

Z-Score0.49

Appropriate for Gestational Age (AGA)

Growth Interpretation

Percentile Markers

< 10thSGA (Small)

10th - 90thAGA (Normal)

> 90thLGA (Large)

About this calculator

Overview

Birthweight percentile is a measurement used to evaluate how a newborn's weight compares to other infants of the same gestational age and sex. It helps identify infants who are Small for Gestational Age (SGA) or Large for Gestational Age (LGA), which can influence immediate postnatal care.

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Pro Tips

Ensure the birth weight is measured accurately within the first hour of life.
Gestational age should be based on the best obstetric estimate (usually first-trimester ultrasound).
Growth patterns may differ based on ethnicity and maternal factors like BMI or smoking status.

Fun Facts

"SGA is usually defined as weight below the 10th percentile."
"LGA is usually defined as weight above the 90th percentile."
"Gestational age is the most significant factor affecting birth weight."
"Percentiles help predict risks for hypoglycemia, respiratory distress, and other neonatal complications."

Formula: Based on Fenton Growth Charts (LMS method) or simplified regression equations.