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Baby Growth Chart Calculator

Plot your child’s weight, length and head size against the WHO growth standards, from birth to five years.

Percentiles worry parents more than almost anything else on a health record. This tool puts your child on the same reference curves a paediatrician reads from, tells you what the number does and does not mean, and is honest about the patterns that are actually worth a conversation.

Your child’s measurements

Birth to five years
Boy or girl *

Boys and girls grow to different reference curves, so this changes the result.

Leave the second date blank to use today.

kg
cm
cm

Optional. Fill in whichever measurements you have — one is enough.

Measuring at home
  • Weigh with no clothes or nappy, on the same scale each time, ideally before a feed.
  • Under two years, length is measured lying flat with the legs gently straightened — two people make this far easier.
  • Head circumference goes around the widest part: just above the eyebrows and around the back of the head.

Your child’s chart will appear here

Enter an age and at least one measurement. You will get the percentile, where it sits against the WHO reference range, and the measurement plotted on a real growth curve.

What growth actually looks like, stage by stage

Children do not grow at a steady rate, and the chart is not meant to be a straight line. These are the patterns underneath it.

Birth to 6 months

Most newborns lose a little birth weight in the first days and have it back by about two weeks. What follows is the fastest growth of their entire life: birth weight roughly doubles by four to five months.

6 to 12 months

Growth slows noticeably once solids start and crawling begins. By the first birthday most babies are close to three times their birth weight, not quite triple, and around 25 cm longer.

1 to 2 years

Appetite drops sharply and fussy eating is near universal. A toddler typically gains only about 2.5 kg across the whole year while adding another 12 cm, so they look leaner than they did as a baby.

2 to 5 years

Growth settles into a steady rhythm of roughly 2 kg and 7 to 8 cm a year. By now most children have found their own line on the chart and tend to stay on it.

A mother lovingly holds her baby on a bed, fostering a sense of care and warmth.

How the calculator works

There is no guesswork in the arithmetic. It is the same method behind the printed charts in a growth record.

1

Enter the age precisely

Under a year, a few weeks moves the percentile more than most parents expect. Use the date of birth rather than a rounded age wherever you can.

2

Add whatever you have measured

Weight, length or height, head circumference. Any one of them is enough, and each is scored against its own reference curve for that age and sex.

3

We convert it to a z-score

Your measurement is compared with the WHO median for that exact age using the published L, M and S coefficients, then turned into a percentile. Between whole months the coefficients are interpolated.

4

Read the direction, not the dot

The chart plots your child against the median and the plus and minus 2 and 3 SD lines. Write the result down, plot it again after the next check-up, and it is the shape between the two points that tells you something.

What a healthy growth pattern actually looks like

Parents read a low percentile as a problem and a high one as a win. Neither is right. Here is what clinicians are actually looking for.

  • A child who stays roughly on the same line, whether that line is the 10th centile or the 90th
  • Small wobbles in weight around illness, teething or a growth spurt, which settle within a few weeks
  • A dip in weight centile somewhere between 6 and 12 months as milk intake falls and activity climbs
  • Length and head circumference climbing steadily even during a week or two when weight sits still
  • Catch-up growth over the first two years in a baby born early or born small
  • A child tracking low but steadily, with good energy and normal milestones, in a family where both parents are short
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What this calculator cannot tell you

A percentile is one number from one moment. These are the four things it will get wrong if you read it on its own.

One measurement is not a trend

A single point cannot tell apart a child who has always been on the 9th centile from one who has fallen there from the 50th over three months. The second needs looking at. The first almost certainly does not.

Home measurements drift

A bathroom scale, a wriggling baby and a tape held slightly crooked can shift a result by a whole centile band. A measurement taken at the clinic is worth more than one taken at home every day.

Prematurity is not corrected here

If your baby arrived before 37 weeks, their age should be adjusted for how early they were, usually until about two years. This tool uses actual age, so a preterm baby will read lower here than they truly are.

Genetics set the line

Two short parents will usually have a child on a lower centile, and that is not a nutritional failure. Growth has to be read against the family, which no chart can see.

Not sure whether to worry?

Most growth questions in the first months come back to feeding, and that is squarely what postnatal care at Eva WomanCare covers: latch and supply, reflux, and the weight checks that follow delivery. If the chart is pointing at something beyond feeding, we will say so and send you to a paediatrician rather than leave you guessing.

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Growth chart questions parents actually ask

Usually not. A percentile describes where your child sits among healthy children, and by definition half of all healthy children are below the 50th. A baby on the 10th who has always been on the 10th, feeds well and is meeting milestones is a healthy baby. What matters is whether they are holding their line. Crossing two major bands downward, say from the 75th to the 25th over a few months, is the pattern worth investigating, whatever the starting point.
The WHO Child Growth Standards, published in 2006. For children under five the Indian Academy of Pediatrics recommends these rather than an India-specific chart, because the WHO curves were built from children raised in recommended conditions and describe how children should grow, not how they happen to grow in one population. The IAP 2015 Indian charts begin at five years, which is exactly where this tool ends.
Yes, and it is expected. Nearly all newborns lose some birth weight over the first few days as they pass fluid and feeding gets established, and most have it back by around two weeks. The point at which it needs a proper feeding review is a loss of more than about a tenth of birth weight, or a baby who still has not regained it by two to three weeks.
Their age needs correcting for how early they arrived. A baby born at 32 weeks is eight weeks early, so at six months of age they are compared against the curve for four months. This correction is normally applied until about two years. This calculator uses actual age and does not adjust, so a preterm baby will read lower here than they should. Ask for a corrected plot at your next visit.
Far less often than most parents do. At routine visits is enough for a well baby: monthly in the early months, then at the immunisation appointments. Daily or weekly home weighing mostly produces noise, and the swings it shows are far more likely to be scale error and nappy contents than anything real. It tends to cause worry rather than settle it.
A short plateau in weight while length carries on is common, particularly through the second year, and often just means a leaner build is emerging. It is worth raising if the plateau runs beyond about a month in a baby under one, if the child seems low on energy, or if length starts to flatten too. Length faltering after weight is the sequence that matters more.
It is the simplest proxy there is for brain growth, which is why it is tracked closely through the first two years. A head measurement drifting well below or well above the expected range, or crossing bands quickly in either direction, is worth a paediatric review even when weight and length look fine.
No. It plots a number and explains it. It cannot examine your child, take a feeding history, look at the previous six months of measurements, or notice the things a clinician notices in the room. Use it to understand what you are being told at appointments, and to know when a question is worth asking, not to decide whether your child is well.
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