Some have already done it a few months ago (they are those of January); for others, there is still a quarter left, (those of December).

In most cases , the girls have returned, after the holidays, transformed, in full stretch, with changes in their body proportions. The top of the class has already had her first period and will grow much less from now on. It takes a head out of the short girl, who has not started puberty and who is still going to take it (she will have her first menstruation after 15 years).

Almost all the boys have started the course as they left the previous one: they are still children. They gamble, they sting, they don’t understand their peers’ nonsense and they have a couple of years left to start feeling the rush of circulating testosterone . Only some, like the top of the class begins to notice changes; His testicles increase in volume, his penis grows and hair grows. This guy will start the lug before the others and change his voice at the same time.

The opposite example, the short child who will have delayed puberty is in this course about 30 cm. the tallest and will grow later. Sometimes your growth at the University will end, which is still a long way off. This boy will have a final size larger than the girls in his class.

These extreme but real examples coexist in many of our 6th grade classes. They are variations of normality, but they pose a great concern to the children who suffer from them and their families.

We must differentiate well what is a pathology from a simple variation of the norm . The idea is that the four boys in the example can find themselves at the age of 25 comparing their respective personal situations without having any sequelae, knowing that they are normal and knowing that the same thing can happen to their children.


Since the birth of our children, pediatricians have accustomed us to this word: “percentile”, that is, the standard graph of the average height of the population to which we belong.

Being in the 25th percentile in height at a certain age means that among 100 people of this age, 75 have reached a higher height and 24 a lower height. The mean of the population corresponds to the 50th percentile and all children with a height between the 97th and 3rd percentiles are considered normal. All children who are above or below these sizes should visit a specialist.

Why is my son taller than me?

Despite the fact that genes are the ones that count the most for a person’s height, there is another aspect that we must take into account. The improvement of the socioeconomic and cultural conditions of the developed countries has allowed an adequate diet to a greater number of people. Adult height has progressively improved and, moreover, it is reached earlier, due to a progressive advancement of the age of puberty. This phenomenon is called “secular acceleration of growth” and is undoubtedly related to an adequate diet during childhood, although it also contributes to the improvement of hygienic-sanitary conditions. As an expression of the acceleration of the size in Spain, we can observe the data that the Spanish soldiers who enlisted between 1903 and 1955 gained only 1.7 cm. on average in their height, while between 1955 and 1985 the increase was 7 cm.

Why are obese children taller?

Obesity during childhood and puberty has a positive influence on growth, since it accelerates it and allows a change in the genetic channel of growth. But we must bear in mind that this improvement is transitory, since, in the event that the obese remains as such, their growth will end earlier than expected, so in the end their genetic size will be maintained.

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