The growth rate of boys and girls: bone age

The growth rate of boys and girls: bone age

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The bone age it does not always coincide with the real age of the child, so there are some taller and others shorter with respect to their chronological age. The rate at which the skeleton grows does not follow a fixed pattern and varies from person to person. It is believed to be an inherited trait, as many parents concerned about their child's height are surprised by a late stretch and recall that they too experienced a similar growth pattern.

To find out if the bone age is late or early, the pediatrician usually asks for aX-ray of the left hand and wrist, where the amount of cartilage that is still available is appreciated. When the cartilage closes, the bone can no longer be stretched. Advancement or delay in bone age is a parameter that is calculated by observing the calcification of the bones in this area, which allows us to establish their maturation and, therefore, their approximate age.

As long as there are no other related diseases (heart disease, celiac disease or growth hormone deficiency) that can influence growth, children usually reach the right height due to their genetic inheritance, although this may occur earlier or later than expected. . To find out how tall you will be, there are several formulas.

One of them is the 'size target ': father's size + mother's size + 13/2 = target size. In the case of male children, 13 is added to the sum of the parents' sizes and in the case of women, 13 is subtracted from the same sum.

Another method is to calculate the "projected size", following on a graph of percentiles, the percentile by which a boy or a girl grows, until the age of 18 years. There are also other calculations that take into account chronological age, height, bone age, growth rate in the last year, and degree of pubertal development. The margin of error is 2 to 4 cm. With this method, the final height can be predicted with a probability of success between 80 and 95 percent.

The results of these formulas may vary a few centimeters above or below because the genetic makeup of one of your parents may have influenced your final height more. In addition, these calculations require adequate health and nutrition conditions for growth to occur normally.

During the first year of life and at puberty, the growth rate is more spectacular. At puberty, the peak occurs at 12 years for girls and 14 for boys, and reaches 20 percent of the total growth. Although there are differences between both sexes that will mark the final height, since growth in girls is shorter and more intense, and in boys, more gradual and prolonged. Therefore, in the end, men will outnumber women by about 13 centimeters.

In addition to height, body mass also doubles and, while boys develop twice as much muscle and skeleton as girls, they tend to accumulate more fat.

You can read more articles similar to The growth rate of boys and girls: bone age, in the category of on-site development stages.

Video: Bone age made easy (May 2022).


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