Ideal Weight For Kids: How Much Your Child Should Weigh

Over the last decade, the health sector has upped the campaign about maintaining ideal weight for kids. Recent studies show that in the US, almost 19.7% of children ages 2-19 have obesity.

This means 19% of children are at an increased risk of getting diabetes, asthma, high blood pressure, and gallbladder disease, not to mention the psychological issues that come with being overweight.

And since overweight children grow up to become overweight adults, early child obesity prevention is critical.

So, how much should a child weigh at every age?

Ideal Weight for Kids

The World Health Organization has a simple weight range for kids under 2 years, while the CDC provides one for kids older than 2. This particular chart shows weights in the 50th percentile, which is the average weight.

PS: For kids born prematurely, use adjusted age when looking up their weight according to age in kg on the chart below. (Adjusted weight is the age they would be if they were born full-term).

Weight Chart according to Age

AgeBoysGirls
Birth7 lb 8 oz (3.4 kg)           7 lb 1 oz (3.2 kg)
1 Month9 lb 15 oz (4.5 kg)9 lb 4 oz (4.2 kg)
2 Months12 lb 6 oz (5.6 kg)11 lb 4 oz (5.1 kg)
3 Months14 lb 2 oz (6.4 kg)13 lb (5.9 kg)
4 Months15 lb 7 oz (7 kg)14 lb 2 oz (6.4 kg)
5 Months16 lb 9 oz (7.5 kg)15 lb 3 oz (6.9 kg)
6 Months17 lb 7 oz (7.9 kg)16 lb 2 oz (7.3 kg)
7 Months18 lb 5 oz (8.3 kg)16 lb 12 oz (7.6 kg)
8 Months18 lb 15 oz (8.6 kg)17 lb 10 oz (8 kg)
9 Months19 lb 10 oz (8.9 kg)18 lb 1 oz (8.2 kg)
10 Months20 lb 5 oz (9.2 kg)18 lb 12 oz (8.5 kg)
11 Months20 lb 12 oz (9.4 kg)19 lb 3 oz (8.7 kg)
12 Months21 lb 6 oz (9.7 kg)19 lb 14 oz (9 kg)
18 Months24 lb (10.9kg)22 lb 8 oz (10.2 kg)
24 Months28 lb (12.7 kg)26 lb 11 oz (12.1 kg)

Average Height and Weight of kids Ages 1 to 18 years

AgeFemale Height
(Inches)
Female Height
(Pounds)
Male Height
(Inches)
Male Height
(Pounds)
127 to 3115 to 2028 to 3217 to 21
231.5 to 3622 to 3232 to 3724 to 34
334.5 to 4026 to 3835.5 to 40.526 to 38
437 to 42.528 to 4437.5 to 4330 to 44
642 to 4936 to 6042 to 4936 to 60
847 to 5444 to 8047 to 5446 to 78
1050 to 5954 to 10650.5 to 5954 to 102
1255 to 6468 to 13654 to 63.566 to 130
1459 to 67.584 to 16059 to 69.584 to 160
1660 to 6894 to 17263 to 73104 to 186
1860 to 68.5100 to 17865 to 74116 to 202

Weight According to Age in KG

On average, babies are born with 5 1/2 to 9 1/2 pounds, with most girls being a few ounces lighter than boys. Though infants lose about 10% of their weight during the first week after birth, they regain it in the second week.

As seen in the chart, babies gain about an ounce daily or a pound every month until they are 3 months old and double their birth weight by 4 months. Kids also have growth spurts, so the weight gain is not always gradual. So don’t be surprised if they add a few ounces in one month and then climb the charts the following month.

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Toddler and Preschooler Ideal Weight

Between ages 1 and 5, a child gains 10 pounds. 5 pounds in the first year and the remaining 5 between ages 2 and 5. This means the normal weight of a 2-year-old in kg is between 10 and 14 kg or 22 and 33 pounds, and a 4-year-old is between 12 to 20 kgs or 28 and 44 pounds.

Toddler and Preschooler Ideal Weight

When they join preschool at age three, the change of environment triggers some stress and decreased appetite. This could lead to slower growth, which will pick up after a few months. Keep offering the child healthy food even if they are not gaining weight.

Elementary Kids Ideal Weight

According to the CDC growth chart, the average weight of a 6-year-old in kg should be between 16 and 23 kgs or 35 and 52 pounds. A 7-year-old should weigh between 14 and 27 kg or 40 and 66 pounds.

Elementary Kids Ideal Weight

A 10-year-old should weigh anywhere between 24 and 48 kg or  54 and 105 pounds. Girls can weigh anywhere from 24 to 46kgs or 53 to 102 pounds. Unless there is a health issue, kids from age 2 should gain weight and grow steadily until they are pre-teens.

Kids’ ideal weight at this age is determined using BMI for age, or body mass index- a formula that uses weight and height to estimate how much body fat a child has.

Ideal Weight For Teenagers

Between ages 9 and 15, a child is likely to go through another growth spurt. Ideal weight for youngsters here will depend on their height, so body mass index for children is still the best weight tracking method.

Ideal weight for teenagers

The CDC says that the average 12-year-old weighs 30 to 58 kg or 66 to 130 pounds. A thirteen-year-old boy will weigh between 32 and 48 kg or 70 to 105 pounds. A fifteen-year-old roughly weighs around 40 to 76 kgs or 90 to 168 pounds.

Also read: 25+ Activities for Pre-Teenagers

Pediatric Weight Standards

How do doctors and pediatricians determine kids’ ideal weight?

Infants below two years use the Personal Child Health Record booklet you are given after giving birth. The road-to-health booklet has a percentile growth chart that acts as a guide every time the child’s weight is taken.

A similar CDC children’s weight chart is used after age 2 to keep track of a child’s growth and weight. This chart shows a graph with the child’s age at the bottom and weight on the vertical axis. Inside the graph are multiple lines labeled percentiles.

Percentiles show how a child’s weight and height (or BMI) compare to other children of the same age and sex. Pediatricians translate the chart into 4 Kids’ weight development benchmarks:

  •  4th percentile or lower is underweight
  • 5th– 85th percentile is a healthy weight for children. Most kids range in the 50th percentile.
  • 85th-94th percentile is overweight
  • 95th percentile or higher is dangerously obese.
Growth Chart according to the CDC

Image source: CDC

Keeping track of a child’s chart over a period of one or two years is crucial to determining their overall health. You cannot get the real picture from just looking at one weight reading. The doctor will examine the chart and see how the percentile lines go.

However, since a high BMI for the pediatric population is not a sign of good or poor health, he will also investigate other parts like cholesterol levels, physical activity, diet, and family history before making recommendations. This is because some children just have heavy bone density, which may make the BMI calculator inaccurate.

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Is BMI for Children Interpreted the Same Way as BMI for Adults?

Body Mass Index for children differs from BMI for adults because it is interpreted relative to age, sex and other children the same age. Though the initial formula is the same, pediatric weight trends are interpreted according to percentiles from the CDC growth charts based on the national survey data.

How Can I Tell if My Child is Obese?

Obesity is defined as a BMI for age above the 95th percentile. They are also overweight if their BMI is continuously in the 85th to 95th percentile. Between the 3rd and 91st centile is the ideal level at which they feel the most comfortable.

Is BMI Accurate in Kids?

BMI for children is not an accurate measure of body fat. Children can have normal BMI and fall in the right percentile but still have too much body fat. It is even less accurate during puberty when kids have a growth surge and gain height or weight drastically.

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