Why WHO’s Infant Growth Chart

How To Accurately Monitor Your Baby’s Progress:

baby growth check up, infant growth chart

Preferably use WHO’s infant growth chart, for your baby boy or baby girl in conjunction with a head circumference chart plus a growth rate calculator for an ideal infant progress comparison.

The World Health Organization(WHO) standards provide a better description of physiological growth in infancy.

WHO growth charts are standards. They identify how WHO standards are based on a high-quality study designed for creating growth charts.

The WHO standards were constructed using length and weight data measured at frequent intervals starting from birth.

The WHO charts below, show how babies should grow, when they are provided optimal conditions: breast feeding and a safe environment.

WHO’s charts show optimal growth that CDC charts don’t do.

The Center for Disease Control(CDC) charts show how all infants grow in USA, under good and not so good conditions.

Growth charts help doctors see if your baby needs supervision, decide if the child has a normal growth increase and take appropriate action.

When looking at an average length/height in different parts of the world; They vary a whole lot.

There are many things that play a roll, like genetics, heritage, illness etc.

However, for babies to reach their inborn growth potential, their nutritional intake during their first year, is most important for physiologic growth.

Babies and children who are growing very slow and not following their growth charts, need to be examined for eventual food intolerance or other conditions that may hamper their growth and health.

It’s smart to know what kind of growth factors impact your baby’s growth in length, head circumference and weight.

Your baby’s weight gain doesn’t inform his or her growth in length nor the head’s circumference increase, a vital factor during your baby’s first 3 months.

Growth Chart For Boys
Infant Growth Chart For Boys
Boys Growth Chart

WHO Infant Growth Chart Baby Boys

  • 1 Inch equals 2,54 Centimeter

Growth Chart For Girls
Infant Growth Chart For Girls
Girls Growth Chart

Who Infant Growth Chart Baby Girls

  • 1 Inch equals 2,54 centimeters

Acknowledgement: WHO, World Health Organization.

Infant Growth Chart Calculator
Pediatric Growth Chart

The calculator requires gender (male or female), birth date of child and length to be entered.

Instruction Inputs

  • Select Gender Male for boys or Female for girls
  • 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.
  • Enter the length of the infant. Note, the units tabs allows the change or selection of inches (standard) or centimeters (metric).
  • 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 of child in years, months and days.

3 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.

A percentile of 50% represents the average or main length.

A value below 50 percent means a baby measures less than the average infant.


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 on 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.

Acknowledgment and Reference: World Health Organization(WHO)
Centers for Disease Control and Prevention (CDC)
National Center for Health Statistics (NCHS)
National Health and Nutrition Examination Survey Data
U.S. Department of Health and Human Services, Centers for Disease Control and Prevention 2008

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