The weight and height of babies say a lot about their physical development. From birth, the baby is weighed and measured and, especially, in the first year of its life, its weight and its growth measurements should be controlled by the pediatrician.
The genetic inheritance and the time of gestation that the baby chooses to be born determine, in principle, its weight and height. Thus, the size of the parents influences the weight and height of the baby not only at the time of birth but also in its later development.
Regarding the moment of delivery, a distinction must be made between those who are born at term and those who are earlier than 38 weeks of gestation. At other times, a maternal illness that has not allowed you to receive enough food during pregnancy or gestational diabetes can also determine the weight and height of the baby at birth.
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Table Of Contents
How much has the baby weighed?
It is the most frequent question that parents answer after the birth of their child along with the name chosen for him. Under 2,500 grams, full-term babies are considered low weight, while above 4,000 grams, the weight is evaluated as high. The average value is located between both measurements and around 3,000 grams.
How much should the baby grow and gain weight?
Measurement of weight and height are routine checks that your pediatrician will carry out at each visit. It is important not to get obsessed with these measurements because the peaks of weight gain and growth are not always the same and, during the first year, they change every quarter.
Thus, during the first three months, weight gain ranges from 750 – 900 grams per month. Between the third and sixth months, it decreases and the increase turns around 500 – 600 grams per month. Between the sixth and ninth month, the weight gain is less, between 350 – 400 grams per month. And finally, between the ninth month and one year of age, the monthly average is between 250 – 300 grams.
Weight and height chart for boys and girls
The tables on the weight and the ideal measurements are indicative, an aspect that you should take into account when weighing and measuring your child. This guidance is NOT a substitute for your pediatrician’s advice. Continue to respect and consider the monthly check-ups indicated by the doctor. He will be the one who will give the last word about the physical condition of your child.
Growth curves in children
Growth curves are graphs used by both pediatricians and nutritionists to verify the evolution of weight as the child grows. There are also curves for height and head circumference. So there must be a balanced growth not only in weight but also in height and head circumference.
Up to 2 years of age, professionals use the weight-for-age curve, where it is verified that the child’s weight gain is according to their age. From the age of two, the age is no longer taken as a reference and the weight for the child’s height is taken into account, in this way it is verified that it is in the desired weight range.
The WHO table for boys and girls
Until April 2006, the growth charts were based on a small infant population, of the same geographic origin, and without distinguishing between breastfed and formula-fed babies. Fifteen years ago, the World Health Organization, WHO, aware of this situation and that these tables could be interfering with the health care of babies, decided to start a much larger study. 
The selected population includes children of various ethnicities and origins, and the novelty is that they have all been breastfed, which is considered the reference standard in terms of nutrition.
Weight and height of Boys
|8 years||23,56 kg||122,86 cm|
|7 years||22 kg||118,50 cm|
|6 years||19,91 kg||112,77 cm|
|5 years||18,03 kg||106,40 cm|
|4 years||16,07 kg||100,13 cm|
|3 years||15,1 kg||96,5 cm|
|2 years||12,9 kg||88 cm|
|18 months||11,8 kg||82,5 cm|
|15 months||11,1 kg||79 cm|
|12 months||10,2 kg||76 cm|
|9 months||9,2 kg||72 cm|
|6 months||8 kg||67 cm|
|3 months||6,2 kg||60 cm|
|Newborn||3,4 kg||50.3 cm|
Weight and height of Girls
|Newborn||3,4 kg||50,3 cm|
|3 months||5,6 kg||59 cm|
|6 months||7,3 kg||65 cm|
|9 months||8,6 kg||70 cm|
|12 months||9,5 kg||74 cm|
|15 months||11 kg||77 cm|
|18 months||11,5 kg||80,5 cm|
|2 years||12,4 kg||86 cm|
|3 years||14,4 kg||95 cm|
|4 years||15,5 kg||99,14 cm|
|5 years||17,4 kg||105,95 cm|
|6 years||19,6 kg||112,22 cm|
|7 years||21,2 kg||117,27 cm|
|8 years||23,5 kg||122,62 cm|