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To calculate a baby’s BMI, convert their weight to kilograms by dividing by 2.2, then convert their height to meters by multiplying by 0.0254. Multiply the height in meters by itself, divide the weight by the height squared, and look up the BMI in a table. Children’s BMIs are different from adults’.
The first thing you need to do to calculate your baby’s BMI, or body mass index, is to convert your baby’s weight to kilograms. To do this correctly, take your child’s weight as a decimal and divide it by 2.2. For example, your baby may weigh 17 pounds, 4 ounces. You’ll use the number 17.25 and divide it by 2.2 to end up with 7.84 kilograms. Write this number down and then continue to convert your baby’s height.
Once your baby’s weight has been converted to kilograms, you can convert his height to meters. To do this, you’ll need to multiply her height in inches by .0254. For example, if her baby is 17.5 inches, she would multiply 17.5 by .0254. This will mean that your baby measures 0.445 meters. Your resulting number can be longer, but you only need four numbers after the decimal point; no rounding is necessary.
After finding the weight in kilograms and the height in meters, the next step is to multiply the height in meters by itself. In the example above, you would multiply .4445 by .4445, and the resulting number would be .1975 meters, which is your baby’s height squared. The baby’s BMI is found by dividing weight by height squared. If the weight of 7.84 kilograms is divided by .1975 meters, then the baby’s BMI would be approximately 39.69.
Once you have the BMI number, you can look it up in the BMI by Age table for your baby boy or girl. This will give you a very good idea if your baby’s growth is on track or if the baby is overweight or underweight. Remember that each baby will grow at a different rate, and a number that may be a little out of range is something to discuss with your doctor, but don’t panic. Calculating a baby’s BMI is a task that can be done at home on a regular basis as you continue to monitor your baby’s growth.
Children’s BMIs are different from adults’, something to keep in mind as your child gets older. In general, a specific formula is used for children and adolescents from 2 to 20 years of age. As children get older, their amount of body fat will change.
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