Description:
This calculator provides your baby's length or height percentile based on age. The percentile shows how your infant's length 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 measures more than 45 babies and measures less than the other 55 babies.

A percentile of 50% represents the average or mean length. 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. This does not mean your baby is over length or under length. A doctor or physician should be consulted to determine length status.

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Instructions:
The calculator requires gender (male or female), birth date of child and length 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 Length	Enter the length 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 length is manually entered.

Output	Parameter	Notes
1	Percentile	Calculated using standard normal distribution
2	Age	Age of child in years, months and days.
3	Length	Length of the baby in metric units of centimeters.
4	Graph Plot	Length 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/.