Normal height for 6 month olds (cm)

Boys, median

67.6cm

Girls, median

65.7cm
cmView this page in inches

Most healthy 6-month-olds are 62 to 71 cm long. On average, boys are a little longer than girls at this age.

Boys: usual range is 64.1 to 71.1 cm (5th to 95th percentile)

Median 67.6
Below 5thUsual rangeAbove 95th

Girls: usual range is 62.0 to 69.5 cm (5th to 95th percentile)

Median 65.7
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.

Length 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
3rd63.6 cm61.5 cm
5th64.1 cm62.0 cm
10th64.9 cm62.8 cm
25th66.2 cm64.2 cm
50th67.6 cm65.7 cm
75th69.1 cm67.3 cm
90th70.4 cm68.6 cm
95th71.1 cm69.5 cm
97th71.6 cm70.0 cm

Growth chart

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

cm406080100120061218243036Age (months)WHO to CDC data6 months
cm406080100120061218243036Age (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 centimeters, the usual range for a 6-month-old is 64.1 to 71.1 cm for boys and 62.0 to 69.5 cm for girls (5th to 95th percentile).

For a 6-month-old, the median for boys is 1.9 cm more than for girls (67.6 vs 65.7 cm).

Length, not height. Under age 2, babies are measured lying down. This is called length. From age 2, children are measured standing up, so the two aren't quite the same.

What's a usual range? Most healthy babies are between the 5th and 95th percentiles. Many healthy babies are shorter or longer than that. What matters is how your baby grows over time.

Percentiles aren't targets. The 50th percentile is the middle: half of babies are longer and half are shorter. It isn't a length to aim for.

How to measure your baby

  1. Measure your baby lying down, with the head and heels in line.
  2. Write down the length to one decimal place, in inches or centimeters.
  3. Use the same method at each checkup.

Nearby ages

2 months3 months4 months5 months6 months7 months8 months9 months10 months

Common questions

Short answers about how these calculators work.

World Health Organization length charts from birth to 23 months. From 24 months, including age 2, we use CDC height charts.

On these growth charts, the 50th percentile for boys is a little above the one for girls at most ages. It describes the children measured for the charts. It isn't a goal.

Sources

Where these numbers come from

  1. WHO Child Growth Standards: Length-for-age percentiles, birth to 2 years (opens in a new tab) - World Health OrganizationLength 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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