WHO Growth Percentile Tables for Children 0-5: A Complete Parent's Guide

What are growth percentiles?

Growth percentiles compare your child's physical measurements against a reference population of healthy children of the same age and sex. If your baby is at the 40th percentile for weight, it means that 40 percent of healthy children of the same age and sex weigh the same or less, while 60 percent weigh more. Percentiles are not grades: a child at the 15th percentile is not necessarily healthier or less healthy than one at the 85th percentile.

The World Health Organization (WHO) published its Child Growth Standards in 2006 after the Multicentre Growth Reference Study (MGRS), which followed more than 8,400 breastfed children from six countries (Brazil, Ghana, India, Norway, Oman and the United States). Because the sample included children raised under optimal conditions, the WHO curves describe how children should grow, not merely how they do grow in a particular population.

How to read WHO growth charts

WHO growth charts plot age on the horizontal axis and the measurement (weight, length/height or head circumference) on the vertical axis. Curved lines represent selected percentiles, typically the 3rd, 15th, 50th, 85th and 97th. The space between these lines defines channels. A child's position on a single visit matters far less than the trajectory over multiple visits.

Weight-for-age

Weight-for-age is the most commonly tracked parameter during the first two years. Newborns typically lose 5-7 percent of birth weight in the first few days and regain it by day 10-14. After that initial period, a healthy infant roughly doubles birth weight by 4-5 months and triples it by 12 months. The WHO chart lets you verify that this trajectory stays within a consistent percentile channel.

Length/height-for-age

Until age 2, length is measured lying down (supine); after age 2, standing height is used. The WHO charts account for the roughly 0.7 cm difference between the two methods. Average birth length is about 49-50 cm, with infants gaining approximately 25 cm in the first year, 12-13 cm in the second year and about 6-8 cm per year thereafter until age 5.

Head circumference-for-age

Head circumference reflects brain growth and is routinely measured until age 2-3 years. The average newborn head circumference is about 34-35 cm, increasing by approximately 12 cm in the first year. Rapid crossing of percentile lines, either upward or downward, may warrant investigation for conditions such as hydrocephalus or microcephaly.

BMI-for-age

WHO provides BMI-for-age charts starting at birth. These are particularly useful from age 2 onward to screen for overweight (above the 85th percentile) and obesity (above the 97th percentile). Unlike adult BMI thresholds, pediatric BMI must always be interpreted relative to age and sex.

Understanding z-scores and growth velocity

Alongside percentiles, pediatricians often use z-scores (also called standard deviation scores) to express how far a measurement is from the median. A z-score of 0 corresponds to the 50th percentile, while -2 and +2 roughly correspond to the 3rd and 97th percentiles, respectively. Z-scores are especially useful at the extremes of the distribution, where small changes in percentile correspond to large clinical differences.

Growth velocity refers to the rate of change in a measurement over time. A child may sit at the 10th percentile and be perfectly healthy if that has been their consistent channel. Conversely, a child at the 70th percentile who suddenly decelerates to the 30th over three months may need evaluation, even though the 30th percentile is well within the normal range. WHO provides velocity tables that complement the attained-growth charts and help clinicians identify deceleration or acceleration earlier.

Normal patterns vs concerning signals

The most important principle in pediatric growth monitoring is that the trend matters more than any single point. Children tend to follow a percentile channel. Healthy children may shift channels in the first 2-3 months as they settle into their genetic trajectory, but sustained crossing of two or more major percentile lines after that period deserves clinical attention.

Faltering growth (previously called failure to thrive) is typically defined as weight falling below the 3rd percentile or crossing downward through two major percentile lines. It can result from inadequate intake, malabsorption, chronic illness or psychosocial factors. Early detection through regular growth monitoring is critical.

When to see a pediatrician

Routine well-child visits already include growth assessment, but there are specific situations where you should seek additional guidance sooner rather than later.

How our child growth percentile calculator helps

Our child growth percentile calculator uses the same WHO reference data described in this article. You enter your child's date of birth, sex, weight and length or height, and the tool instantly returns the exact percentile and z-score for each measurement. It also provides visual feedback so you can see where your child falls on the curve.

While the calculator is a powerful tracking tool, it does not replace professional medical advice. Use it to prepare for your next well-child visit by having your child's latest measurements ready and already interpreted against the WHO standards.

Nutrition and growth in the first five years

Adequate nutrition is the primary modifiable factor driving healthy growth. The WHO recommends exclusive breastfeeding for the first six months, followed by the introduction of nutritionally adequate and safe complementary foods while continuing breastfeeding up to two years or beyond. Breastfed infants typically grow faster in the first few months and then slow relative to formula-fed infants, which is one reason the WHO standards differ from older CDC references that reflected a formula-heavy population.

Iron deficiency is the most common nutritional deficiency worldwide in young children and can impair both physical growth and cognitive development. Starting at around six months, when iron stores from birth begin to deplete, iron-rich complementary foods such as fortified cereals, pureed meats and legumes become essential. Vitamin D supplementation is recommended for all breastfed infants from birth in many countries, as breast milk alone does not supply enough to prevent rickets.

After the second birthday, children transition to a family diet. Focus on variety: fruits, vegetables, whole grains, lean proteins and dairy. Avoid excessive juice, sugary snacks and highly processed foods that provide calories without nutritional value. If a child is consistently above the 85th percentile for BMI-for-age, a pediatric dietitian can help design an age-appropriate eating plan that supports growth without excess weight gain.

Practical tips for accurate measurements at home

Growth monitoring is one of the simplest and most effective tools in pediatric healthcare. The WHO percentile tables give parents and clinicians a universal language for assessing whether a child is thriving. Use our child growth percentile calculator to stay on top of your child's development between checkups, and bring the results to your pediatrician for a complete clinical picture.