Baby Infant Growth Chart Calculator - Head Circumference Age Percentile Graph

Head Circumference for Age
Percentile Chart and Calculator
Infants and Babies from 0 (birth) to 3 years of age
Health Care - Pediatrician - Pediatrics - Pregnancy

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Description:
This calculator provides your baby's head circumference percentile based on age. The percentile shows how your infant's head circumference compares to other infants. The percentile tells you what percentage of babies measure less than your baby. For example out of a sample of 100 babies, a percentile value of 45 percent means your baby has a head circumference greater than 45 babies and measures less than the other 55 babies.

A percentile of 50% represents the average or mean head circumference. A value below 50 percent means a baby measures less than the average. A value greater than 50 percent means a baby is above average. A doctor or physician should be consulted to determine head circumference status. Head circumference can be used as a diagnoses of microcephaly, hydrocephalus and macrocephaly.

Instructions:
The calculator requires gender (male or female), birth date of child and head circumference to entered.

Inputs:

Step	Instructions	Notes
1	Select Gender	Male for boys Female for girls
2	Enter Birthday	The date the baby was born. Select the field to pull up a calendar or use the up and down arrows to increment or decrement by days.
3	Enter head circumference	Enter the head circumference of the infant. Note, the units tabs allows the change or selection of inches (standard) or centimeters (metric).
4	Press Calculate button	This is only needed to when the head circumference is manually entered.

Outputs:

Output	Parameter	Notes
1	Percentile	Calculated using standard normal distribution
2	Age	Age of child in years, months and days.
3	Head Circumference	Head circumference of the baby in metric units of centimeters.
4	Graph Plot	Head circumference versus age graph with 5, 10, 25, 50, 75, 95 and calculated percentile lines.

Reference:
Centers for Disease Control and Prevention (CDC). National Center for Health Statistics (NCHS). National Health and Nutrition Examination Survey Data. Hyattsville, MD: U.S. Department of Health and Human Services, Centers for Disease Control and Prevention, 2008 http://www.cdc.gov/growthcharts/.