Skip to main content

Infant Growth Percentile Calculator - New Born to 36 Months

  • Synopsis: Published: 2011-02-07 (Revised/Updated 2016-11-05) - Baby growth percentile calculator to obtain an infants weight and height percentile in comparison to a national average. For further information pertaining to this article contact: Ian Langtree at Disabled World.

Main Document

Quote: "A baby born within the normal range of mass for that gestational age is known as appropriate for gestational age (AGA)."

Doctors often use a percentile calculator to assess an infant's weight and height percentile in comparison to national averages.

What Does Percentile Mean

In statistics and the social sciences, a percentile (or centile) is the value of a variable below which a certain percent of observations fall. For example, the 20th percentile is the value (or score) below which 20 percent of the observations may be found. The term percentile and the related term percentile rank are often used in the reporting of scores from norm-referenced tests.

How much does your baby weigh? And how does that weight compare to other babies? A Growth Percentile Calculator makes it easy to keep track of your child's growth and weight measurements as it can determine the percentiles for all children ages birth to 3 years old. For children ages 2 to 19 years you will need to use our our Child Percentile Calculator.

By using a Growth Percentile Calculator at home you can easily judge if your infant growing adequately and he or she is gaining weight and height at the normal rate. A percentile chart gives parents a good idea concerning how their baby's developmental progress compares with other babies nationwide of a similar age.

Typical growth percentiles for infants include the following:

  • Weight - Babies are typically undressed before being weighed.
  • Length - Until your baby can stand, she'll be measured from head to heel while lying down.
  • Head Circumference - Usually a tape measure is placed around the largest area of the head.

A percentile of 50% represents the average or mean weight. A value below 50 percent means a baby weighs less than the average. A value greater than 50 percent means a baby is above average. This does not mean your baby is overweight or underweight. A doctor or physician should always be consulted to determine weight status.

Birth mass is the mass of a baby at its birth. It has direct links with the gestational age at which the child was born and can be estimated during the pregnancy by measuring fundal height. A baby born within the normal range of mass for that gestational age is known as appropriate for gestational age (AGA). Those born above or below that range have often had an unusual rate of development - this often indicates complications with the pregnancy that may affect the baby or its mother.

This calculator provides your baby's weight percentile based on age, enter your infant's measurements into the Growth Percentile Calculator below to obtain all their percentiles based on infant growth charts. For example out of a sample of 100 babies, a percentile value of 45% means your baby weighs more than 45 babies and weighs less than the other 55 babies.

Infant Growth Percentile Calculator
Enter the Following Information:
Gender of Baby
Age of Baby in Months months
Body Weight
Body Length
Head Circumference
Calculation Results
Length for age is in the percentile
Weight for age percentile is
Weight for length percentile
Head circumference for age percentile
Automatic recalculation

Infant Growth Percentile Calculator provided by

Related Information:

  1. Body Mass Index Calculator for Children - Calculate Child BMI Measurement
  2. Average Height to Weight Chart - Babies to Teenagers

Information from our Calculators & Charts: Health Weights & Measures section - (Full List).

Comments: We apologize but until we find a new secure & accessible comments plugin this area is not available.

     What will I receive?

Loan Information for low income singles, families, seniors and disabled. Includes home, vehicle and personal loans.

Famous People with Disabilities - Well known people with disabilities and conditions who contributed to society.

List of awareness ribbon colors and their meaning. Also see our calendar of awareness dates.

Blood Pressure Chart - What should your blood pressure be. Also see information on blood group types and compatibility.

  1. Nonprofit Disability Solutions Connects Jobseekers with Top Companies
  2. CSD Learns Awarded $75,000 Grant from Wells Fargo
  3. 2016 FBI Hate Crime Statistics
  4. People Who Experience Dry Eye Soon to Have Drug-Free Solution