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Average Weight of 9 Month Old

Pediatricians are constantly monitoring the weight of the child from birth to 1 year. Stable weight gain is an important indicator of the proper development of the baby. Maintaining the dynamics of growth and weight allows you to maintain the health of the child.

There are statistics to be able to focus on something. They include the lowest allowable weights, averages, and the highest possible values. Intermediate weight options serve as additional data for its control.

The physical development of the child is assessed by observing the norms of weight and height. Strict adherence to accepted standards does not make sense. All children are different and everyone has their weight reference point. It is important not to seriously exceed the maximum and minimum limits.

The average weight of 9 month old

The average weight for 9 month old boys is 20.5 lb. The average weight at the same age for girls is 18.7 lb.

9 Month Old Baby Weight

Average weights for boys and girls at 9 months of age differ by 1.7 lb. The total difference closer to the year can reach 2 lb. It all depends on the conditions in which the child grows, risk factors for deviations in weight, and other reasons.

Every Baby has Different Weight

You need to follow the averages but do not try to strictly match them. Children are completely different. They are not required to grow according to the norms of methodological recommendations and statistical data. A baby can be born with a weight of 5.5 lb or maybe with a weight of 9 lb. This indicator will be the starting point for the subsequent control of weight norms.

Factors affecting weight

There are a large number of factors that will affect the weight of a child. These include genetics, physiological characteristics of the ethnic group, diet, mother’s milk deficiency, etc.

There are a lot of reasons for parents to worry after the birth of a baby. Weight in this list takes a leading position. Everything is in order if it is not below the average norm. The main thing is to focus on the maximum permissible values. They demonstrate the presence or absence of a problem.

Specify the possible reasons for the violation of weight norms when visiting a pediatrician. Any factors that can shift the schedule of monthly weight gain should be recorded.

How Much Boys Weight at 9 month Old

The normal weight for a 9 month old boy is between 17 lb and 24.7 lb. Any weight within the allowable range is considered good for that age. Extreme indicators are the limits of acceptable values. They are used to make a diagnosis of being underweight or overweight.


The average weight for a 9 month old boy should be 20.5 lbs based on CDC data. This is a relative show that characterizes the average weight of children born with approximately the same weight. Do not treat this figure as a mandatory norm that must be followed. The child may weigh slightly below or above the indicated value. It all depends on the factors that affect weight and individual growth rates.

5th Percentile Weight

The lower weight limit for 9 month old boys is 17 lb. If your baby’s weight is significantly lower, this confirms the fact of constant malnutrition. It leads to weight loss. A long-term trend of being underweight can lead to malnutrition and serious health problems.

95th Percentile Weight

The upper limit of normal weight for boys of 9 months is 24.7 lb according to statistics. There is an excess of weight if your baby has reached this mark. Beyond it comes the risk of obesity. Make sure that the baby does not approach the maximum weight limit. Its excess can be extremely bad for the health of your child.

How Much Girls Weight at 9 month Old

A weight between 15.6 lb and 22.4 lb is considered normal for a nine month old girl. Everything that is included in this interval can be safely called a good weight for this age. Weight limits will be critical marks. Outside of them, obesity or malnutrition can develop. The weight of a particular girl of 9 months will depend on her genetics, health, and other factors.


The CDC states that the average 9-month-old girl weighs 18.7 lbs. This is the reference weight that is considered the most optimal and shows the level of physical development of a child of this age. Deviations from the standard are allowed. The main thing is that they do not go beyond the upper and lower norms.

5th Percentile Weight

The 5th percentile weight of a 9 month old girl is 15.6 lb. This is the lower limit of the allowable weight value. A child is more likely to be malnourished if his performance is much lower than these norms. Numerous symptoms associated with deterioration in health and well-being will immediately appear with a nutritional deficiency.

95th Percentile Weight

The extreme upper mark of the normal weight for a girl of 9 months is 22.4 lb. Anything above this limit is considered the start of obesity. Exceeding the maximum norm can only be permissible if it is not maintained permanently. Being at the level of the border of the highest mark in weight is also not very good. This is already an excess of body weight with which you need to fight.

What is Considered Obesity for 9 month old?


You can talk about obesity if the weight mark has gone far beyond the 95th percentile weight. A weight of 23 lb and above is already the onset of obesity at 9 months, according to the CDC. It will be noticeable that the child is much larger than the prescribed norm, even without weighing. Obesity can be the result of hereditary diseases or an unhealthy lifestyle organized by parents.


If a boy weighs 25.3 lb or more at 9 months, this is obese. This is about the fact that the child has problems with metabolism or excess nutrition. The cause may be a serious illness. It is worth immediately taking measures to reduce weight when an obesity problem is detected.

Overeating will inevitably lead to overweight and further obesity. It is worth adjusting the child’s nutrition a little if he visually becomes fatter. Consult your doctor if the trend of strong weight gain persists. Only he can prescribe a diet.

Signs That Baby is Not Eating Enough

Insufficient nutrition leads to being underweight. There is a noticeable decrease in the norms and it is hard not to notice. Watch for signs of nutritional deficiencies to understand in time whether your baby is full or not:

  • The child is too nervous The baby is constantly freaking out especially when he eats breasts. He is always dissatisfied with something, is very capricious, and shows excessive anxiety.
  • Decreased number of diapers used per day A small amount of bowel movements indicates a nutritional deficiency.
  • Monthly underweight trendWhen a baby gains less than 0.4 lb for 1-2 months, then he is malnourished.
  • The baby falls on its side when crawling This is a sign of dizziness from malnutrition.

Recommendations for Parents and Their Babies

All possible recommendations and advice on the care and feeding of an infant should come from competent sources of information. Approach decision-making carefully so as not to harm your child. Diet and any other nutritional changes should be agreed with the doctor. Among a large number of recommendations, choose only those that do not contradict the individual characteristics of your child.

Nutrition and Diet

Your baby should be eating well solid foods by 9 months. The diet can include almost all vegetables, non-allergenic fruits, proteins, and meat. The value of dietary meat rich in iron is very important at this age. The risk of developing anemia at 9 months is high.

Remember that the baby is still too young to eat regular food. Introduce each product gradually. Avoid flour products and sweets. Don’t let your child overeat. The diet can be prescribed for obvious obesity. This method is an extreme measure in the fight against excess weight.


Expand the list of physical exercises for your child. Now it should be as active and mobile as possible. Visit the pool, and take massage courses, if necessary, therapeutic. Do gymnastics with a ball. Start each morning with hygiene procedures and light exercises. Rub the legs and arms of the child, bend and unbend them. Let the baby pull up and walk, holding on to support. Give freedom and large space to crawl.

Sleep separately

If you still practice co-sleeping with your child, then it’s time to cancel it. You interfere with each other by being close during sleep. The baby will constantly look for the breast when breastfeeding, even when he does not want to eat. These are instincts. The baby suckles at the breast not only for nourishment but for milk to be supplied. Such frequent feedings will lead to overeating.

Walk outside more often

Walking in the fresh air normalizes sleep and improves appetite. This improves immunity, energizes, and gives a supply of vitamin D. Walking has a good effect on the nervous system and soothes and relaxes. Harmonization of biorhythms is observed. The child is less sick. This favorably affects the stable preservation of weight.

Why Your Baby’s Weight is Not Close to Average

It is necessary to adhere to the norms of weight adequately. All children are different. They eat in their way, in certain volumes that suit them. Children grow up in different families, they have their rhythm of physical activity and sleep patterns. Average weights for age cannot be the same for everyone.

Sleep failures

Frequent withdrawal from daytime naps and switching to one nap. Intermittent sleep at night. As a result, a mode is lost that knocks out of the norms all indicators of development, including weight.

Too little or too much food

Mistakes in the use of complementary foods are often made at 9 months. Many mothers are in no hurry to give meat to the child, and someone else has not introduced cereal. This can lead to a shortage of the average norm by weight. In another case, the child is allowed to eat almost everything, including sweets and flour. The result is excess weight.

Features of body build

Whether your baby is large or small will be clear even in the womb. This feature cannot be changed. The complexion of the baby will be preserved in the subsequent months of its development. This will also affect adult life. The average weight of such children may be below the established standards.


The psyche of a child of 9 months is too vulnerable. Anything can put him into a state of stress: fear, quarrels in the family, moving, a sharp change in schedule. A lot of stress causes early weaning from breast milk. All this violates any norms related to the development of the child.

The anxiety of the mother

Increased anxiety in the mother often leads to overfeeding. A mother in such a psychological trap constantly thinks that her baby is malnourished. The weight of the child and his health suffers due to her rash actions.

Excess of physical activity over rest

Weight will be significantly reduced if the balance between the period of rest and activity is not established. Rest should harmoniously compensate for strong physical, mental, and emotional stress.

When Should You Worry?

A cause for concern may be strong external changes in the child. Obesity will be noticeable immediately and you need to reactively take action as in the case of excessive thinness of the baby. It is worth considering if there are signs of anemia. The risk of its development is especially increased at 9 months. Even a mandatory analysis is assigned to check the level of iron in the blood.

Hemoglobin can drop extremely quickly if the baby is sick with the virus and at the same time was malnourished. Make sure that the child remains alert, does not fall on his side at the time of crawling, and is not lethargic.

Persistent diarrhea or constipation is not normal for a child who has been on solid foods for 3 months. Follow the diet, and drinking regimen, and everything will be fine. You need to sound the alarm if the baby has not gained at least 0.4 lb in a month.

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