Baby Weight Chart by Month in kg: The WHO Table Indian Doctors Use, and When Babies Reach Each Diaper Size

The nurse at the six-month vaccination visit writes 6.9 kg on the card, puts a dot on the curved lines, and hands it back. On the way home the family WhatsApp group reports that a cousin's baby, born the same week, weighs 8 kg.

By evening you have typed "baby weight chart by month in kg" into your phone and found five pages with five different numbers. One says your baby is fine. Another prints a "healthy range" with no source and leaves you doing sums.

The number on the card is not the thing to read, and neither is the cousin's. The chart your doctor uses has a spread built into it, and once you can see that spread the dot makes sense. The full table is below, in kilograms, boys and girls, birth to two years.

Why the chart Indian doctors use is the WHO one

The curved lines on a clinic growth card in India come from the WHO Child Growth Standards. The Indian Academy of Pediatrics says so in one sentence in its 2015 growth chart paper: "IAP recommends use of WHO standards for growth assessment of children below 5 years of age."

So a page that prints its own "Indian healthy range" is working from something other than the chart your paediatrician plots on. The WHO weight-for-age tables are public, free and in kilograms, which is why this guide copies its numbers from them rather than from another blog.

WHO publishes the standard as percentiles. The 50th percentile, or median, is the weight that half of all babies of that age and sex are below. The 3rd and 97th mark the edges: roughly 94 babies in 100 sit between them, so the band is wide on purpose.

Baby weight chart by month in kg: boys and girls, birth to two years

Every value below is read from the WHO weight-for-age percentile tables for boys and girls, which we downloaded and checked on 28 October 2026. Weights are in kilograms, to one decimal, exactly as WHO prints them. The files run to five years; this table stops at two.

The last column shows which size band the median weight falls in on the Pampers India size chart, as listed when we checked on the same day: NB up to 5 kg, S 4 to 8 kg, M 7 to 12 kg, L 9 to 14 kg, XL 12 to 17 kg. Where two bands overlap at that weight, both are shown.

Baby ka weight kitna hona chahiye? Read the band, not the number

Take the dot from the card and find the row. A six-month-old girl at 6.9 kg sits between the 3rd percentile (5.8 kg) and the median (7.3 kg). A six-month-old boy at 8 kg sits just above his median. Both are inside the band, and the band is the answer to "baby ka weight kitna hona chahiye": anywhere between those two edges is where the WHO standard expects most babies to be.

A search for "baby weight chart for girl in kg" lands on the same table as the one for a boy; use the three girls' columns, which run a little lighter at every age. And the cousin's 8 kg tells you nothing, because at six months the band is more than 3 kg wide for both sexes.

What the table does not do is hand out verdicts. A weight at or beyond the 3rd or 97th line is a reason for the doctor to look closer, not a label for a blog to attach. If anything about your baby's growth worries you, ask your doctor rather than grading from a chart, including this one.

One more limit. If your baby was born early, this table is not the one to use; your doctor follows a different method for premature babies, so ask which chart they are plotting on.

Newborn weight gain chart in kg: the first weeks run differently

The NHS page on baby height and weight says it plainly: "It's normal for babies to lose some weight in the first few days after birth," and "Most babies are at, or above, their birthweight by 3 weeks." That is why the top row of the table is a starting point, not a target for week one.

After that the climb is steep, and the median column shows how steep. A boy at 3.3 kg at birth reaches 7.0 kg by the 4-month row, a little more than double; a girl at 3.2 kg reaches 6.4 kg at 4 months, exactly double. Three times birth weight comes later: 9.9 kg for that boy falls between the 12-month (9.6) and 15-month (10.3) rows, and 9.6 kg for that girl is the 15-month row.

So "doubles by four months, triples a little past the first birthday" is a reading of the median column, not a rule your baby must meet. A baby who started near the 15th line gains along her own line. That first row is also why the newborn essentials checklist keeps the NB packs small.

How often to weigh a baby

More weigh-ins do not give more information. After the first 2 weeks, the NHS advises weighing "no more than once a month up to 6 months of age", "no more than once every 2 months from 6 to 12 months of age", and "no more than once every 3 months over the age of 1". If your clinic weighs at each vaccination visit, you are close to that rhythm already.

There is a practical reason for the spacing. Between the 9- and 12-month rows the median moves by only 0.2 to 0.3 kg a month, about one large feed, so a bathroom scale at home mostly measures the last meal and the last wet diaper. Let the clinic scale write the dot.

This is the part to remember: follow the line, not the number

The NHS gives the rule in one sentence: "Their measurements may go up or down by 1 centile line, but it's less common for them to cross 2 centile lines." If that happens, the NHS says, "talk to a health visitor"; in India, that is your paediatrician.

So the question at each visit is not "is 6.9 kg good" but "is the dot on the same line as last time". A baby who started near the 15th line and is still near it at nine months is growing the way the chart expects. A baby who was on the 50th and is now below the 3rd has crossed two lines, which is the signal the chart was built to show.

Four lines for reading the card at home:

• Find the dot, then the printed curve it sits closest to; that curve is your baby's line.
• Compare with your baby's earlier dots, never with another baby.
• Up or down one line over a few months is common; two lines is a conversation with your doctor.
• Weight is one line of several; length is plotted too, and the doctor reads them together.

From the weight chart to the diaper size chart by weight in kg

The last column exists because diaper packs are sized by weight, not age. Read along the median: a typical boy crosses 7 kg, the bottom of the M band on the Pampers India chart, at about 4 months, and a typical girl between 5 and 6 months. The 9 kg line that opens L arrives at about 9 to 10 months for a boy and a little after the first birthday for a girl.

Your baby is not the median, so use the table to plan and the pack to decide. It tells you roughly when the next size will come up; the waist and thigh checks in our diaper size guide tell you when it has. Huggies and MamyPoko print the same S to XXL numbers as Pampers, as our brand-by-brand chart comparison shows, but any brand can revise its chart, so read the pack.

The overlaps are the useful part. A median boy fits S or M from the 4-month row to the 6-month row: the window for small packs of both rather than a carton of one, as how many diapers a baby needs per day explains. If that is also when you move from tapes to pants, read when to switch to pant diapers first, because the two formats can carry different bands.

Before the next clinic visit

Keep the card. The dots on it are worth more than any baby weight chart India's websites can print, including this one, because they are your baby's own line. Bring the questions, ask your doctor, and let the number on the scale be one dot among many.

If the weigh-in says the next band is close, the printable diaper fit checklist covers what to look at once the new size is on. If solids are starting too, the baby food chart by age shows what the spoon can hold at each stage from six months.

If the dot sits low and the question is what to put on the plate, baby weight gain food by age gives the quantities the ICMR-NIN and IAP charts actually print, after the curve check above.

This guide shares general information for parents and is not medical advice. Speak to your baby's doctor about any persistent skin irritation or health concern.