According to the CDC, most 13-year-old girls weigh between 76 and 148 pounds (lb). The 50th percentile for weight in this group is around 101 lb. This means that about 50% of girls this age weigh less than 101 lb. If a 13-year-old girl weighs under the fifth percentile, a doctor may classify this as being underweight.
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.
Many guys and girls are skinny until they start to go through puberty. The changes that come with puberty include weight gain and, in guys, broader shoulders and increased muscle mass.
Even though a 13 year old who is 70 kg is considered to be overweight as they suggest you should be weighing more like 50 to 60 plus kg, you are a growing teenager (providing that you are still growing, I'm only saying this because when I was your age I stopped growing unfortunately for me).
However, as per the Centers for Disease Control and Prevention report, 13-year-old males weigh between 35.8 kg and 55.7 kg and girls weigh between 34.4 kg and 54.3 kg.
A majority of people who have gone through puberty do not have obesity just after puberty because pre-pubertal and pubertal weight gain are gradual and obesity develops over a period of many years. Therefore, more people are obese later in life.
But if they do need to slim down, experts say teens shouldn't drop more than 2 pounds a week. Talk with your child to get their buy-in. They have to be on board and involved with any plan to lose weight.
It is usually easier to lose weight as a teenager than as an adult due in part to metabolic differences. It is beneficial to achieve and maintain a healthy weight as a teen and carry it forward into adulthood.
It's considered a normal transformation for girls to gain weight, particularly in the stomach area. What is this? Don't fret too much if you notice your daughter is gaining belly fat before puberty. It's all part of the growth plan.
You'll probably gain weight in puberty -- most girls do. You may notice more body fat along the upper arms, thighs, and upper back. Your hips will grow rounder and wider; your waist will become narrower. Your doctor will check your height and weight each year to make sure you are growing properly.
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.
Adult Body Mass Index
If your BMI is less than 18.5, it falls within the underweight range. If your BMI is 18.5 to <25, it falls within the healthy weight range. If your BMI is 25.0 to <30, it falls within the overweight range. If your BMI is 30.0 or higher, it falls within the obesity range.
BMI weight ranges
below 18.5 is underweight. between 18.5 and 24.9 is healthy. between 25 and 29.9 is overweight.
Noticeable weight gain may occur prior to a growth spurt as excess fat helps promote growth. As a child goes through puberty, their stores of body fat may change.
Your child will experience many changes in their body during this time. For girls, puberty usually occurs between ages 10 to 14, and for boys, between ages 12 to 16.
In Stage 2, physical changes begin. Between the ages of 8 and 13, girls typically experience: Their breasts begin to bud, and their areolas (pigmented area around the nipple) enlarge. Scant pubic hair appears.
Teens should limit their fat intake to 25 to 35 percent of their total calories every day and they should choose unsaturated fats over saturated fats whenever possible.