Children under one year: height and weight tables

The height and weight of a child under one year

Children under one year: height and weight tables

In the first minutes of her life, a newborn baby undergoes her first test. Maternity hospital staff assesses the condition of the baby according to different criteria. For this purpose, there are special estimation scales – Apgar, Silverman.

All other parameters have a special meaning for the weight and height of the newborn child. They can even display the baby's carrying conditions. After the birth of their indicators and correspondence to each other will be determined regularly, every month, which will allow to control the harmonious development of the crumb.

Height and height of a child under one year: WHO norm

For the determination of a child's normal weight and height, and for their evaluation, there are many formulas, methods, tables, and charts. But in most cases, doctors are guided by World Health Organization standards.

For ease of use by WHO experts, we have created so-called centimetres that allow us to quickly and easily determine whether the height and weight of children of different ages comply with established norms. The central tables take into account the differences in growth rates and physiology.

The middle column (50%) corresponds to the average height and weight, the two columns on either side of it (25% and 75%) are lower and higher than the average, the next two columns (10% and 90%) are low and high, and the extreme left (3%) and right (3%) correspond to very low and very high height/weight.

Percent indicates the frequency of spread.

For a better understanding of how to work with centennial tables, this is an example: if 100 children of the same age are ranked in the middle, 50 of them, who are in the middle, will have an average height, 25 in each direction – below and above the average, the first three in this rank will be very high, and the last three – very low. By the same token, and with body weight.

Central table of boys' height and weight up to one year

This is just an average of approximate values that should be used as a guide, but which cannot be taken as an absolute truth. The disturbances must cause significant deviations from these standards. In any case, well-being and health indicators always play a major role, not height and weight.

Table of child height and weight gain up to one year

In Soviet pediatrics, and this practice has been maintained to this day, height and especially body weight gain of newborns have played an important role.

Because the genetic characteristics of a baby that is born larger or smaller than other infants may appear from birth, and not always the average data.

All the same, if such a child develops well and regularly adds weight, if there is a positive trend in body weight gain, in most cases it indicates the well-being of the baby's health.

This table is used not only by doctors, but also by mothers who are worried about whether the baby is getting enough milk and eating. As you can see, the most intensive weight gain takes place in the first 3 months of life, and after half a year it slows down a little, which is primarily due to the increase in physical activity of the baby: he is already turning over, starts to sit, and then crawl, take the first steps.

It should be clarified that the weight gain rates in the table are applicable to healthy children. Any disease can have a noticeable effect on a newborn's body mass. Most babies lose weight during and after infectious diseases and diarrhoea when they are unable to breastfeed.

Besides, breastfed babies usually gain weight more slowly than artificial babies. There are several reasons for this. The reason is usually because the mother is afraid not to feed her beloved child and gives him more formula than necessary. Like cow's milk, they can contribute mainly to muscle building rather than brain development, which is what mother's milk does.

If we talk about growth, by the end of the first year of life the baby grows by an average of 25 cm. The older the child gets, the slower he grows. Growth is most active in summer and at night.

What should the height and weight of a newborn baby be like by month

In most cases (they are the “norm”), babies are born with a body weight of 2600 g to 4000 g.

In recent years, the upper limit has been increasingly pushed forward because the trend towards the birth of babies with high body weight continues. Today, doctors already consider a baby's weight within the range of 4500 g.

The body weight of a newborn missing to the lower limit is considered low, and children born with a weight greater than 4.5 kg are considered large.

Both categories of newborns are in the spotlight of physicians because they are at risk. Skinny babies stay in the hospital for nursing until they reach a normal body weight. Large babies undergo a series of studies to rule out possible pathologies and health problems.

First days after birth, a newborn baby usually loses weight. Drying umbilical cord process, intensively evaporates moisture from its skin and through the lungs while breathing, leaves meconium and excreted urine, meanwhile, the process of breastfeeding is not yet established.

All this leads to the fact that during the first 3-5 days of his life, the baby may normally lose 6-8%, sometimes up to 10% of its weight. However, the child's body recovers quickly: The 7-10-day-old baby returns to its original weight and begins to actively multiply it.

What concerns growth, it is 46-56 cm at birth. The average corresponds to an estimate of “4”. The total neonatal growth rating scale consists of 7 points, with “1” being very low and “7” being very high. This is a central table scale.

Corresponding weight and height of a child under one year can be calculated using a simple empirical formula. Thus, it is believed that in 6 months the baby weighs an average of 8200 g and has a body length of 66 cm. If the growth is less than this, it is necessary to subtract from the body weight of 300 g for each missing centimeter, if more – then add 250 g.

According to this formula, the weight and growth of the newborn, who turned more or less than half a year, is calculated as follows:

BES. If the child is younger than six months: 8200 g – 800xN (where N is the number of missing months); if the child is older than six months: 8200 g + 400xN (where N is the number of extra months).

ROST. If the baby's under six months old: 66 cm – 2.5 x N (where N is the number of missing months); if the child is over six months old: 66 + 1.5 x N (where N is the number of extra months).

Related deviations: underweight, overweight, and height of the newborn

While there are many ways to determine the height and weight of a newborn baby, each cannot be one hundred percent objective. Because the most important thing is always not the weight and height figures, but the health, well-being and harmony of the baby's development.

In any case, you can not ignore the genetic predisposition and individual physical characteristics of the newborn. Little skinny parents aren't gonna have a hero. At the same time, neonatologists and obstetricians note that every next child in the family is born slightly larger than the previous one. To determine if there is really an excess or deficiency in the body weight of a newborn, it is necessary to calculate the body mass index:

I = M / H2,

where M is the weight of the child in kilograms, H is the height of the child in meters.

Results are compared by table:

Body mass index is used to estimate the correspondence of weight and height to each other and to a certain age of the baby.

The reason for additional studies should be significant deviations from the norm. For example, children with allergies often have a lower body weight, but there may be other reasons. Premature infants always weigh less in the first months of life than others. But if you are overweight, you should first of all exclude diabetes.

In this regard, special services – a calculator of the child's height and weight by weeks, which allow you to calculate the height and weight of a newborn, based on his age, are very popular. But all these calculators are based on the data from the tables in our article.

At that's why you should never jump to conclusions. The main thing is to show the baby to the pediatrician regularly. He will assess not only his growth and weight by months (mainly their dynamics), but also other indicators of development and well-being of the baby.

Specially for Elena Semenova


Centre physical development tables for boys and girls, what is the value of assessment

Children under one year: height and weight assessment tables

The baby grows every day. In order to evaluate the child's physical growth, to understand if he or she is developing correctly, there are central tables.

Pediatricians regularly evaluate the child's weight and size while observing the child, advising parents on what to do if the child's parameters are significantly different from the average.

Proper physical development is important for the child's subsequent life.

What is this centennial and pediatric centennial table

The principle of these tables is that centennial values are divided into 100 intervals, most often used: 3, 10, 25, 50, 75, 90 and 97. Centiles are values (height, weight, head circumference, and chest circumference) that have a certain number of children to examine.

They are used to quickly assess how a child is developing and whether the data are normal (the average of most children of a particular age). The norm is the number of attributes specific to half of the healthy boys and girls, i.e. the interval between 25 and 75 cents.

The benchmark is the sign of physical development defined as the 50th centile.

Tables are easy and convenient to apply. We need to weigh and measure the baby, find his age and see what corridor his data got into. Center corridor is the interval of the centering scale corresponding to your child's performance. For convenience, the centering corridors are marked with numbers from 1 to 8, and the columns marking the norm are marked with color.

The indicators on the left (1-3) and right (6-8) are rated as lower and higher than the average. Corridors 2 and 7 are areas of focus that may require additional consultation. Corridors 1 (very low) and 8 (very high) – there is a possibility of pathology of development.

Under the corridor numbers, the quantitative limits of the attribute are given for a certain percentage (percentage, centile) of children of a given age and sex.

Example: boy, age 3 months. Determine the level of its physical development from the tables:

  • body length – 60 cm, average (corridor 5);
  • weight – 5600 g, average (corridor 4);
  • li>Chest circumference 39 cm, average (corridor 5);

  • Head circumference 40 cm, average (corridor 4).

In order to use the centrifugal tables, the child needs to measure

Square-average deviation “σ” (usually denoted by the Greek letter “sigma”) to estimate how much the values from the set can differ from the average value. The estimation of body length/height using “σ” is made by calculating the mean square deviations from 50% of the values of growth rates of a given age group.

Estimation of the indicator:

  • within ± 1 σ – average growth;
  • from ± 1 σ to ± 2 σ – below/above average growth;
  • from ± 2 σ to ± 3 σ – low/high growth;
  • out of +/- Зσ – very high (gigantic)/very low (dwarfism) growth.

Not a child's performance is normal

Very low and the highest rates are sometimes found in healthy children. They can be related to weight at birth, mom and dad parameters, or metabolism.

Diagnoses by centtile tables are never set. Failure to get back to normal on any of the indicators doesn't mean anything. In order to assess the physical size of the child, it is necessary to determine the corridor in which the child's data fall. If they remain within the same corridor or differ by one or two, then the child develops proportionally.

When the difference is more than two corridors, it indicates a nonharmonious formation. If the paediatrician detects this difference, there is no need to be afraid, in such cases the baby may be referred for further examination or consultation to find out the cause.

It is quite possible that the baby is healthy, just has such features or hereditary signs.

Child infants often do not develop evenly. One month may be a weight loss, but the next month it may be the other way around. Parents need to record and compare their child's performance so they don't have to worry about it again. Under one year of age, children should be seen by a paediatrician every month to see if they are growing up correctly.

For boys and girls, different tables have been created because boys usually grow, gain body weight and develop faster. For children, growth is of paramount importance. Everything else is considered in conjunction with it, i.e. with increasing body length other indicators (weight, head circumference and chest circumference) increase.

Girls' breast and head circumference and weight Proportionality of girls' height and weight Proportionality of boys' height and weight Proportionality of boys' breast and head circumference Proportionality of boys' height and weight Proportionality of boys' weight and height for any parents their child is the best, and its harmonious physical development is very important. Sentimental tables are reference materials that show the notional values. You can't tell if a crumb is healthy or not, but you can get a hint on what to look for.

  • Elina Rozko


Child height and weight charts

To make it easier for paediatricians and mothers to navigate through a huge number of numbers, handy graphical tools have been created to monitor the child's height and weight – tables and charts. Of course, these methods are very indicative only when all measurements are made correctly.

For this purpose, try to weigh the baby on the same scale, and measure growth – one centimeter. It is also important that the child during the examination was calm, because otherwise it will be difficult to determine the weight of the baby, who wriggles, pulls handles and legs, and also shouts at full power.

informationIf your child is restless on the day of measurement, it is better to postpone this procedure another time.

Now let's go directly to the height and weight tables of the child up to one year.

Child growth chart

3 months

AgeAverage growth, seeAverage body weight, kg
1 month

2 months

2 months56-585,0-5,3
3 months59-616.0-6.3
4 months

4 months62-646.5-6.9
5 months

5 months64-687,4-7,8
6 months66-707,7-8,0
7 months68-718,3-8,9
8 months70-728,5-9,5
9 months71-739,3-9,9
10 months72-749,5-10,4
11 months73-759,8-10,5
td>12 months74-7610.1-10.7

Other indicators of physical development

As well as the basic parameters, it is important to note the circumference of the baby's skull and chest, as they are also basic and help to assess the physical development of the baby.

AgeMiddle head circumference, seeMiddle chest circumference, see
1 month36.6-37.336.0-37.3
2 months38.4-39.038.4-39.0
3 months40-40.940.0-40.9
4 months41-41.941.0-41.3
5 months42.2-43.242.2-43.2
6 months43.2-44.244.3-45.5
7 months

7 months/td>

8 months44.3-45.446.0-47.2
9 months45.3-46.346.7-47.9
10 months45.6-46.647.0-48.3
11 months46.0-46.947.7-48.7
12 months46.4-47.247,7-49,0

I want to emphasize the fact that not every child will correspond to the average parameters. After all, there are factors that affect the development of the baby, but in no case are pathological. For example, parents, whose height does not exceed 160 centimeters, are unlikely to have a tall baby. And that's okay, because every kid is different.

It was precisely this fact that prompted WHO (World Health Organization) to create handy diagrams that clearly show the dynamics of child development (height, weight).

AdvancedWe recommend that you pay attention to the diagrams below, because once you have learned how to use these tools, you can always be sure that the results are correct and that the child's height and weight are in accordance with the norm by months.


Let's make a small Likbez and on the example of one of the parameters let's explain how to use diagrams.

Italy, on the given diagram limits of growth rate of girls up to two years are specified. Vertically there are data on the child's body length, and horizontally – the child's age by months. For example, in two months your child's height is 57 centimeters.

We find the number 2 horizontally, vertically – we choose the desired division. Find the point where the growth line and age line intersect. We see that it falls on the green curve.

This means that the formation and development of the child in terms of growth corresponds to the average.

Interline, there are so-called “corridors” (always counted from bottom to top):

  • – your baby is very low;
  • First – low growth;
  • Second and third – medium;
  • Fourth – child's height is slightly above average;
  • Fifth – your child is considered to be high.

In the normal development of the child and the child's weight will occur in the same or adjacent corridors.

To keep a convenient record of the child's weight and height, fill out this chart every month after consultation with a pediatrician. This method will allow you to assess the formation and development of the child much more objectively, compared to the classical method (tabular), which does not take into account the individual characteristics of each child. Print out the charts you need for convenient use.


If you noted that the diagrams show that the formation and development of a child deviates from the norm, you should consult a specialist.

Perhaps it's all about the constitutional features, or the mother's milk has become insufficient, and it's time to introduce complementary food, and perhaps it's a latent pathological condition, the identification of which will help to avoid further complications.

So, Pediatrician consultation is required in the following cases:

  • the child develops steadily in the first or fifth corridor;
  • the weight or height curve sharply went down;
  • the difference between the weight and body length corridor ≥1. For example, the child's height is in the fourth and the weight in the second.


    Become familiar with the different methods of assessing the formation and development of your child, you can monitor your child's condition on your own, and if necessary, do not delay the consultation with a doctor.


    Calculator for calculating the height and weight of a child

    Children under one year: height and weight estimation tables

    All parents need to know how well their baby is developing.

    Does the child keep up with weight, height, or outpace them? To determine this, we suggest you use our height and weight calculator.

    It gives a full assessment of these indicators, taking into account the age, (to the accuracy of one day), as well as calculates the BMI (Body Mass Index).

    All values, methodologies, and recommendations are taken from the World Health Organization (WHO), which has conducted an extensive study on the development of children of different ages, nationalities, and countries.

    Height (body length)

    Body length is usually measured in babies under two years of age. After two years, they already measure growth in the standing position, respectively. There may be a difference of 1 cm between height and weight, which may affect the result of the assessment. In this case, if a child under two years of age is specified as tall, the calculator converts the child to length and vice versa for accurate calculation.

    Rost is one of the most important indicators for assessing the child's development. It is recommended to measure it every month. (see growth tables for more details).

    Estimates of “stunted” and “very stunted” can indicate that a child was born prematurely.

    Estimates of “very high” can also indicate the presence of endocrine disorder. However, if at least one of the tallest parents is likely to be the norm in this particular case, but it is still worthwhile to consult a doctor to be sure.

    Very short height estimates:

    Very short: A significant height loss may be accompanied by overweight. It is necessary to examine a specialist to determine the cause and to eliminate the growth retardation. Small : Stunting is also sometimes overweight. A doctor's consultation is recommended. Below average : Low child, but within normal range… Average : A child has the same average height as most healthy children. Above average : Tall child, within normal height. High: This increase is rare, mostly hereditary and cannot indicate any abnormalities. Very high : This growth may be normal in the presence of high parents, and a sign of endocrine disease. We recommend that you consult a specialist. Height is not age-appropriate : Height is not age-appropriate – maybe an error in entering indicators. Please check the data and use the calculator again. If the data is correct, it's a clear anomaly. A detailed examination of the specialist is necessary.

    In itself, weight without height and other data does not give an in-depth assessment of the child's development. However, the “Low Weight” and “Extremely High Weight” scores are sufficient for consultation with a doctor (for more details see the weight central tables).

    Viewable weight scores:

    High underweight, extremely low weight : High probability that the child is malnourished. It is necessary to have an immediate examination by a doctor. Obesity, low weight : Probably the child's body is exhausted, it is necessary to examine a specialist… Less than average : Weight is within the lower limits of the weight limit for the age indicated. Average : The child has an average weight, just like most healthy children. Above average : Weight should be estimated based on BMI (Body Mass Index) data when obtaining this estimate. Very large : Weight should be estimated on the basis of BMI (Body Mass Index) data when obtaining this estimate. Weight does not correspond to age : An error may have been made when entering the data. If all the data are true, the child is likely to have problems with height or weight development (see height and BMI estimates). We recommend that you consult an experienced physician.

    For the assessment of the child's development harmony, it is customary to look at the height-to-weight ratio – Body Mass Index (BMI). This indicator allows the most accurate determination of the child's weight deviations or, conversely, shows that the child's weight in relation to height is normal for his or her age

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