As for 40kg, 40kg translates into 88.18lbs which at your height is a BMI of: 23.8. This BMI and Weight are completely normal for a boy of your size, however, according to this you are near the border of “Overweight” but you are still in the normal zone.
What is the average weight for a 13-year-old? According to the Centers for Disease Control and Prevention (CDC), most 13-year-old girls weigh around 76–148 pounds (lb) and most 13-year-old boys weigh between 75 and 145 lb, but this can vary widely.
Normal or healthy weight = BMI 18.5-24.9 kg/m. Overweight = 25-29.9 kg/m. Obese = 30 – 39.9 kg/m. Extremely Obese = 40 kg/m2 or greater.
For example, a 7-year-old boy who is 3 feet 11 inches (119 cm) tall would have to weigh at least 56.9 pounds (25.8 kg) ( BMI = 17.9) to be considered overweight, and a 13-year-old girl who is 5 feet, 3 inches (160 cm) tall would be considered obese if she weighed 161 pounds (73 kg) ( BMI = 28.5).
It's expected that all tweens will experience a weight increase, called preteen weight gain. When you look at the total amount of weight gained across the span of the teenage growth spurt, it is significant. That awkward, pudgy appearance many tweenagers go through is a completely normal part of puberty.
under 18.5kg/m2 – you are considered underweight and possibly malnourished. 18.5 to 24.9kg/m2 – you are within a healthy weight range for young and middle-aged adults. 25.0 to 29.9kg/m2 – you are considered overweight. over 30kg/m2 – you are considered obese.
The CDC report that the average weight of a 12-year-old male is 89 lb , or about 40 kg.
45 (kg) divided by 2.25 (height squared) = 20. This means a person with a height of 150cm and a weight of 45kg would have a BMI score of 20. According to the BMI, that person would be in the “healthy weight range”.
Healthy Weight For A 13-Year-Old:
Many calculators online can help you determine your child's BMI. A 13-year-old boy who weighs more than 85 pounds has an unhealthy weight. A girl of the same age who weighs more than 95 pounds has an unhealthy weight.
BMI weight ranges
below 18.5 is underweight. between 18.5 and 24.9 is healthy. between 25 and 29.9 is overweight.
No, you are fine as weight is irrelevant at such an age unless you are 80+ kgs, but even then as long as your diet and lifestyle is healthy, you are healthy. With this, most kids do overcome fat and turn out to be healthy young adults in their post teen years.
So according to a bmi chart your suggested weight range is 112 - 151Lbs. But many factors such as bone mass, muscle mass and fat percentage are important too. If you are a lot over or under this weight range, consider changing your diet and/or exercise. You are still young so don't push it.
Yes, she is over weight.
Choosing a seat
Seats which conform to BS EN 14344 are designed to carry children who are between 9 - 22 kg's (roughly 9 months - 5 years of age) in weight or between 9 - 15 kg's. Make sure your child is within the weight range of the seat you choose.
For example, a 10 year old boy who is 140 cm tall (4'7") and weighs 45 kg would have a BMI of 22.9 (45 divided by 1.4 x 1.4) which would mean they are technically overweight.
BMI Calculator
A BMI of 25-29.9 kg/m2 is overweight. A BMI of 30-34.9 kg/m2 is obese (Grade I). A BMI of 35-39.9 kg/m2 is obese (Grade II). A BMI of ≥40 kg/m2 is obese (Grade III) or morbidly obese.
If you place 1kg of muscle on a scale and 1kg of fat on a scale, they will both weigh 1kg. The difference is in total volume. 1 kg of muscle may appear to be the size of baseball whilst 1kg of fat will be three times the size and look like a wobbly bowl of Jelly.
Lean body mass in girls diminishes from approximately 80 percent to 75 percent by the end of puberty, while the amount of body fat increases. In comparison, the percentage of lean muscle mass in boys increases from about 80 percent to 90 percent by the time they reach adulthood.
Puberty – Increased hormones in a child's body during puberty (between the ages of 10 and 14 for girls and between the ages of 12 and 16 for boys) leads to growth and possible expansion of “baby fat” areas. This typically takes place in girls' belly, breast area and hips.