Normal weight for 6 month olds (kg)

Boys, median

7.9kg

Girls, median

7.3kg
kgView this page in pounds

Most healthy 6-month-olds weigh 6 to 10 kg. On average, boys weigh a little more than girls at this age.

Boys: usual range is 6.6 to 9.5 kg (5th to 95th percentile)

Median 7.9
Below 5thUsual rangeAbove 95th

Girls: usual range is 6.0 to 8.9 kg (5th to 95th percentile)

Median 7.3
Below 5thUsual rangeAbove 95th
Based on World Health Organization growth charts for children under 2. Growth is judged over several visits, not one measurement.

Check your child

Pick months for babies and toddlers up to 24 months, or years for ages 2 to 20.

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For children under 2, we use World Health Organization growth charts. From age 2, we use CDC growth charts.

Weight percentiles at 6 months

These numbers come from World Health Organization growth charts, which US doctors use for children under 2. From age 2, we use CDC growth charts.

PercentileBoysGirls
3rd6.4 kg5.8 kg
5th6.6 kg6.0 kg
10th6.9 kg6.2 kg
25th7.4 kg6.7 kg
50th7.9 kg7.3 kg
75th8.5 kg7.9 kg
90th9.1 kg8.5 kg
95th9.5 kg8.9 kg
97th9.7 kg9.2 kg

Growth chart

How weight changes with age for boys and girls, by month.

kg05101520061218243036Age (months)WHO to CDC data6 months
kg05101520061218243036Age (months)WHO to CDC data6 months

The wider shaded area shows the 5th to 95th percentile. The narrower area shows the 25th to 75th. The lines show the median for boys and for girls. See the table

  • Boys, median
  • Girls, median
  • Boys, 5th to 95th percentile
  • Boys, 25th to 75th percentile
  • Girls, 5th to 95th percentile
  • Girls, 25th to 75th percentile

What it means

In kilograms, the usual range for a 6-month-old is 6.6 to 9.5 kg for boys and 6.0 to 8.9 kg for girls (5th to 95th percentile).

For a 6-month-old, the median for boys is 0.6 kg more than for girls (7.9 vs 7.3 kg).

Growth charts for babies. For babies and toddlers under 2, we use World Health Organization growth charts. From age 2, we use CDC growth charts. US doctors follow the same switch.

What's a usual range? Most healthy babies are between the 5th and 95th percentiles. Many healthy babies are above or below that range. Doctors look at the trend over several checkups, not one weight.

Percentiles aren't grades. The 50th percentile is the middle: half of babies weigh more and half weigh less. It isn't a target weight.

How to measure your baby

  1. Weigh your baby without clothes or a wet diaper, on a scale set to zero.
  2. Write down the weight to one decimal place, in pounds or kilograms.
  3. Use the same scale at the same time of day when you compare.

Nearby ages

2 months3 months4 months5 months6 months7 months8 months9 months10 months

Common questions

Short answers about how these calculators work.

In the US, doctors use World Health Organization growth charts from birth to 2 years and CDC growth charts from age 2. We follow the same switch.

Not from one number. A percentile shows where a child falls compared with others the same age. Your child's doctor looks at it along with height, growth over time and a checkup.

Sources

Where these numbers come from

  1. WHO Child Growth Standards: Weight-for-age percentiles, birth to 5 years (opens in a new tab) - World Health OrganizationWeight growth charts for babies and toddlers under 2
  2. 2000 CDC growth charts for the United States (opens in a new tab) - CDC, 2000Growth charts for children 2 and older
Medical disclaimer Healthly is for general information only. It isn't medical advice and can't diagnose or treat any condition. Talk with your doctor about your own numbers. If you think you're having a medical emergency, call 911 or your local emergency number. How we get our numbers

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