General Practice 2022

Boy's ideal weight (by age, height and BMI)

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Boy's ideal weight (by age, height and BMI)
Boy's ideal weight (by age, height and BMI)
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A child's ideal weight varies according to age and height, and should be checked monthly by a pediatrician during the first year of life, as too low or too high a weight can harm their development and growth.

Generally, weight gain is faster in the first 12 months of life, and as the boy grows, the tendency is for weight gain to be slower, as the child becomes more active, burning more calories and slowing weight gain.

It is important to remember that development is not the same for all children, and there may be times when the boy does not increase as much as other children of the same age. In case of doubt about the weight, it is always recommended to consult the pediatrician, or a nutritionist, to evaluate the case and identify if there is really a problem.

How to assess a boy's weight

To find out if the boy's weight is within normal parameters, up to the age of 18, enter the data in our calculator:

The formula that the calculator uses to estimate a boy's weight varies according to age:

  • Up to 2 years: percentile curves of weight evolution are used for each month of life;
  • From 2 to 5 years: weight is evaluated according to the boy's height;
  • From 5 to 18 years: weight is verified using the child's BMI.

In the first 2 years of life it is important that growth is balanced and therefore, in addition to the weight percentile curve, other fundamental percentiles such as height and head circumference should also be evaluated.

Up to 2 years: weight according to percentile

Up to 2 years of age, a boy's weight is assessed using percentile curves, which show the evolution of the child's weight each month. This table presents the range of values ​​between the 15th percentile and the 85th percentile, according to the World He alth Organization:

Age Optimal Weight Range Age Optimal Weight Range
1 month 3, 8 - 5.0 kg 1 year and 1 month 8, 8 - 11.0 kg
2 months 4, 8 - 6.4 kg 1 year and 2 months 9.0 - 11.4 kg
3 months 5, 6 - 7.2 kg 1 year and 3 months 9, 2 - 11.6 kg
4 months 6, 2 - 7.8 kg 1 year and 4 months 9, 4 - 11.8 kg
5 months 6, 6 - 8, 4 kg 1 year and 5 months 9, 6 - 12.0 kg
6 months 7.0 - 8.8 kg 1 year and 6 months 9, 8 -12.2 kg
7 months 7, 4 - 9.2 kg 1 year and 7 months 10.0 - 12.5 kg
8 months 7.6 - 9.6 kg 1 year and 8 months 10, 2 - 12.8 kg
9 months 8, 0 - 10 kg 1 year and 9 months 10, 3 - 13.0 kg
10 months 8, 2 - 10, 2 kg 1 year and 10 months 10, 4 - 13.2 kg
11 months 8, 4 - 10, 6 kg 1 year and 11 months 10, 6 - 13.4 kg
1 year 8, 6 - 10, 8 kg 2 years 10, 8 - 13.6 kg

It is important that weight gain happens on a regular basis, as very rapid increases or very rapid losses can be related to he alth problems, such as diabetes or hyperthyroidism, for example.

If the boy's weight is above or below the values ​​indicated by the World He alth Organization, it is recommended to take him to the pediatrician or nutritionist, who can carry out a more detailed assessment and check if any changes are necessary. in the feed.

2 to 5 years old: weight for height

From 2 years and up to 5 years, weight must be evaluated according to the boy's height, as shown in the following table:

Stature Optimal Weight Range
65 cm 7.0 - 8.0 kg
70 cm 8.0 - 9.5 kg
75 cm 9.0 - 10.5 kg
80 cm 9, 7 - 11.0 kg
85 cm 10, 7 - 12.7 kg
90 cm 12.0 - 14.0 kg
95 cm 13.0 - 15.2 kg
100 cm 14.0 - 16.7 kg
105 cm 15.5 - 18.5 kg
110 cm 17.0 - 20.5 kg
115 cm 18.5 - 22.5 kg
120 cm 20.5 - 24.5 kg

This table is constructed according to the reference values ​​indicated by the growth curves of the World He alth Organization.

When the boy suddenly increases or decreases in weight, it can be a sign of a he alth problem, such as diabetes or hyperthyroidism, and in these cases, it is advisable to consult a pediatrician.

Over 5 years: Child BMI

To know the ideal weight of a boy from 5 years to 18 years,must calculate the BMI. If the BMI is considered normal, the boy is at the recommended weight for his age and height.

To find the BMI, enter the data in the calculator:

Attention: the child's BMI calculator is not suitable for calculating weight before 5 years old, it is better to follow the tables presented above or follow the pediatrician's instructions and the information present in the baby's book.

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