To find out what percentile your baby is in for weight, height, or head circumference, you need to compare your baby's measurements to standardized growth charts based on age and sex. The percentile indicates how your baby’s size compares to other babies of the same age and sex:

• A percentile of 50% means your baby is average size—50% of babies are smaller and 50% are larger.
• A percentile below 50% means your baby is smaller than average.
• A percentile above 50% means your baby is larger than average.

You can use online baby percentile calculators where you enter your baby’s birthdate, measurement date, weight, height/length, and head circumference to get the percentile results based on WHO or CDC growth charts

. Percentiles are not fixed indicators of health; consistent growth along a percentile curve is more important than a single measurement. Small shifts are normal, but sudden large changes or inconsistencies between weight and height percentiles may require a pediatrician’s evaluation

. In summary:

• Use a baby percentile calculator with your baby’s age, sex, and measurements.
• Percentile tells you the percentage of babies smaller than your baby.
• Consistent growth along a percentile curve is a sign of normal development.
• Consult a doctor if your baby’s growth pattern changes suddenly or is disproportionate.

This approach helps you understand your baby’s growth relative to peers and when to seek medical advice if needed