Growth and Weight Standards for Children Under One Year (+ Chart)


Each baby has their own unique program for growth and development, but there are certain weight and height standards for a child’s first year that all parents should know. The thing is, any significant deviation from these data can be a cause for concern and a reason to see a doctor.

To ensure that your little one is developing according to their age, we have prepared a chart of child development in the first 12 months of their life, as well as information on possible reasons for deviations from the norm.

Read on and stay healthy!

Chart of growth and weight standards for children under one year

Indicators such as a baby’s height and weight can tell a lot about their physical development. Of course, every person, even the smallest one, is unique, but any serious deviations from commonly accepted values serve as a reason for concern for parents and doctors.

According to the World Health Organization, the healthy weight of a newborn baby ranges from 2.8 to 4 kg on average. In addition, weight depends on the child’s gender.

Boys, on average, weigh about 3,500 g at a height of 50 cm, while girls weigh 3,300 g at a height of 49.5 cm.

We have gathered the most up-to-date information that will help you calculate your child’s weight and height up to one year old:

Boy’s height

Agebelow normalshortlower limit of normalnormalupper limit of normaltallabove normal
0 month44,2-46,146,1-48,04849,951,851,8-53,753,7-55,6
1 month48,9-50,850,8-52,852,854,756,756,7-58,658,6-60,6
2 month52,4-54,454,4-56,456,458,460,460,4-62,462,4-64,4
3 month55,3-57,357,3-59,459,461,463,563,5-65,565,5-67,6
4 month57,6-59,759,7-61,861,863,96666,0-68,168,1-70,1
5 month59,6-61,761,7-63,863,865,96868,0-70,170,1-72,2
6 month61,2-63,363,3-65,565,567,669,869,8-71,971,9-74,1
7 month62,7-64,864,8-67,06769,271,371,3-73,573,5-75,7
8 month64,0-66,266,2-68,468,470,672,872,8-75,075,0-77,2
9 month65,2-67,567,5-69,769,77274,274,2-76,576,5-78,7
10 month66,4-68,768,7-71,07173,375,675,6-77,977,9-80,1
11 month67,6-69,969,9-72,272,274,576,976,9-79,279,2-81,5
1 year68,6-71,071,0-73,473,475,878,178,1-80,580,5-82,9

Boy’s weight

Agebelow normalshortlower limit of normalnormalupper limit of normaltallabove normal
0 month2,0-2,52,5-2,92,93,33,93,9-4,44,4-5,0
1 month2,9-3,43,4-3,93,94,55,15,1-5,85,8-6,6
2 month3,8-4,34,3-4,94,95,66,36,3-7,17,1-8,0
3 month4,4-5,05,0-5,75,76,47,27,2-8,08,0-9,0
4 month4,9-5,65,6-6,36,377,87,8-8,88,8-9,8
5 month5,3-6,06,0-6,76,77,58,48,4-9,49,4-10,4
6 month5,7-6,36,3-7,17,17,98,98,9-9,99,9-11,0
7 month6,0-6,66,6-7,47,48,39,39,3-10,310,3-11,4
8 month6,2-6,96,9-7,77,78,69,69,6-10,710,7-11,9
9 month6,4-7,17,1-8,088,99,99,9-11,111,1-12,3
10 month6,6-7,47,4-8,28,29,210,210,2-11,411,4-12,7
11 month6,8-7,57,5-8,48,49,410,510,5-11,711,7-13,0
1 year6,9-7,77,7-8,78,79,710,810,8-12,012,0-13,3

Girl’s height

Agebelow normalshortlower limit of normalnormalupper limit of normaltallabove normal
0 month43,6-45,445,4-47,347,349,25151,0-52,952,9-54,7
1 month47,8-49,849,8-51,751,753,755,655,6-57,657,6-59,6
2 month51,0-53,053,0-55,05557,159,159,1-61,261,2-63,2
3 month53,5-55,655,6-57,757,759,861,961,9-64,064,0-66,1
4 month55,6-57,857,8-59,959,962,164,364,3-66,466,4-68,6
5 month57,4-59,659,6-61,861,86466,366,3-68,568,5-70,7
6 month58,9-61,261,2-63,563,565,76868,0-70,370,3-72,5
7 month60,3-62,762,7-65,06567,369,669,6-71,971,9-74,2
8 month61,7-64,064,0-66,466,468,871,171,1-73,573,5-75,9
9 month62,9-65,365,3-67,767,770,172,672,6-75,075,0-77,4
10 month64,1-66,566,5-69,06971,57474,0-76,476,4-78,9
11 month65,2-67,767,7-70,370,372,875,375,3-77,877,8-80,3
1 year66,3-68,968,9-71,471,47476,676,6-79,279,2-81,7

Girl’s weight

Agebelow normalshortlower limit of normalnormalupper limit of normaltallabove normal
0 month2,0-2,42,4-2,82,83,23,73,7-4,24,2-4,8
1 month2,7-3,23,2-3,63,64,24,84,8-5,55,5-6,2
2 month3,5-3,93,9-4,54,55,15,85,8-6,66,6-7,5
3 month4,0-4,54,5-5,25,25,96,66,6-7,57,5-8,5
4 month4,4-5,05,0-5,75,76,47,37,3-8,28,2-9,3
5 month4,8-5,45,4-6,16,16,97,87,8-8,88,8-10,0
6 month5,1-5,75,7-6,56,57,38,38,3-9,49,4-10,6
7 month5,3-6,06,0-6,86,87,68,68,6-9,89,8-11,1
8 month5,6-6,26,2-7,07899,0-10,210,2-11,6
9 month5,8-6,56,5-7,37,38,29,39,3-10,610,6-12,0
10 month5,9-6,76,7-7,57,58,59,69,6-10,910,9-12,4
11 month6,1-6,96,9-7,77,78,79,99,9-11,211,2-12,8
1 year6,3-7,07,0-7,97,9910,110,1-11,511,5-13,1

During the first weeks and months of their lives, babies actively gain weight and grow. In fact, during the first month alone, an infant can gain about 600 grams and grow by a whole 3 centimeters!

Another month later, your little one will grow another 3 centimeters and gain about 800 grams!

However, as your son or daughter gets older, these changes will occur more slowly.

For example, the average height and weight of a 1-year-old child are:

  • for a girl – 9,500 grams and 73.8 centimeters;
  • for a boy – 10,300 grams and 75.5 centimeters.

To ensure that you have the most accurate measurement of your baby’s weight gain, we recommend that you weigh your little one before and after feeding.

Many parents also wonder how to measure the height of a newborn at home.

  • Method 1. Place your little one on the changing table so that the head of the little human rests against the wall or edge of the table. Now carefully straighten the legs and make a mark on the diaper. Then simply measure the resulting distance using a ruler.
  • Method 2. First, lay a ruler (or tailor’s tape measure) flat on the changing table. Now lay your little one on the table again so that his or her head touches the wall. Straighten the legs and measure the distance by applying a ruler to the baby’s feet. The point at which the ruler and tailor’s tape measure intersect is your baby’s height.

Deviations from the norm and their possible causes

Now that you know WHO data on a child’s height and weight up to one year, you can easily check how your measurements correspond to accepted standards.

Please note that children cannot grow to a template, so approximately 10% of infants may have different measurements from the generally accepted ones.

Cause for concern – a sharp increase in weight over a short period of time, as well as a significant deviation in height from our table data.

There can be several reasons:

  • Excessive body weight occurs when mothers overfeed their little ones and force them to eat when they are not hungry. Your little one should learn to hear the natural signals of their body, so pediatricians recommend feeding babies on demand. Good practice for preventing childhood obesity is exclusive breastfeeding (at least for the first 6 months of life).
  • Underweight occurs in cases where you do not feed your little angel enough or provide them with insufficient calorie food. If you are breastfeeding, pay close attention to your own diet.
  • Another possible cause of weight problems in one-year-olds is a disrupted metabolism. In this case, you need to consult your doctor.
  • Regarding growth disorders, they can be caused by genetics, hormonal imbalances, cerebral palsy, nervous system and cardiovascular diseases, oncology, or genetic disorders. Usually, dwarfism or gigantism cannot be recognized in one-year-old children. This becomes clear as the child grows older. There is no need to worry: this happens extremely rarely. However, to rule out possible pathology and find out if everything is okay with your little one, make sure to check the ratio of a child’s height and weight before the age of one in a timely manner.

We wish every little one to grow up healthy and happy!

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