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Average Weight of 12 Month Old

The development of a child is determined by several indicators. One of them is weight. Mom is told with what weight and height the baby was born immediately after birth. This data will be the starting point by which you need to navigate further weight indicators every month.

The US Centers for Disease Control and Prevention provides extensive information on weight statistics for children of various ages. It shows the average monthly norms, the lowest, highest, and intermediate weight options. You can control the weight gain of the child guided by these data.

Consider the characteristics of your baby, lifestyle, the presence of diseases, and other factors when assessing his weight. Only in this way will the analysis be adequate and objective. Proceed from what his complexion was during uterine life and at birth.

The average weight of 12 month old

The average weight of a boy at 1 year old is 22.7 lb according to statistics. Girls at this age weigh 1.8 lb less. Their average weight will be 20.9 lb.

12 Month Old Baby Weight

The average weight norms were established in the study of children who were born with approximately standard parameters. Strong deviations from these indicators will indicate the presence of nutritional problems.

Girls and boys have different weight norms for the same age. Most male children are born larger according to statistics. This is not always the case and it happens that girls weigh more. It all depends on the influence of various factors.

Every Baby has Different Weight

You can use data from the CDC to monitor your child’s weight. They will help to understand the limits of permissible weight limits. All children are different and there are situations when no standards fit. A child may be born prematurely or have subjective features of complexion.

Children are not stamped at the factory according to the template. They grow at their own pace and therefore each child will have their weight.

Factors affecting weight

There are a large number of different factors that can affect weight. Among them, there are many genetically incorporated and those that can be eliminated. Ethnic features of the body structure and complexion are difficult to adjust, but you can adjust the diet, eliminate health problems or put the baby on a diet.

The average value of the weight can vary greatly under the influence of various factors. There is no reason to worry if the weight is not below the established norm. It is more important to follow the extreme indicators of the norms.

How Much Boys Weight at 12 month Old

The normal weight range for a 1 year old boy is from 19 lb to 27.3 lb. Weight within this range is considered acceptable. Everything that is outside the scope is a deviation from the norm. Initially, large boys in further development occupy the upper positions of the norm. If the birth weight was low, then in subsequent months it will be average or closer to the low norm.


The average weight of a boy at 12 months is 22.7 lb. The baby achieves such results if it is born with a body weight of at least 6.6 lb. He maintains weight gain rates by months and stably holds average positions. A slight excess of the average weight is not critical. It is more important that there is no threat of obesity or malnutrition.

5th Percentile Weight

The lower limit of normal weight for a boy at 12 months is 19 lb. This is the 5th percentile weight below which the parameters of the baby should not fall. The minimum value of body weight with a long-term trend of weight loss may indicate a nutritional deficiency. The lack of weight is fraught with irreversible consequences for the health of the child.

Supplementary nutrition, expansion of the diet, the addition of vitamins – this is an ambulance with a lack of weight. Sometimes the measures to restore norms are more radical.

95th Percentile Weight

The upper limit of normal weight for a one-year-old boy is 27.3 lb. The 95th percentile weight is the limit beyond which obesity occurs. All indicators close to these norms can be overweight. If a child has a lot of bad eating habits, eats at night, and moves little, then his path to excess body weight will be short.

How Much Girls Weight at 12 month Old

Girls weigh at 12 months from 17.6 lb to 25.1 lb. Weight in this interval is considered normal. Anything outside the specified values is a problematic weight. It can be more or less than the allowed values. Consider how much your girl weighed at birth and what are her rates of weight gain per month when restoring weight norms.


The average weight for a 12-month-old girl is 20.9 lb. This is the figure that will be achieved if the baby has gained from 0.4 ounces every day for the past few months. Minor deviations from the indicated average norms are permissible. A strong excess of weight beyond the upper and lower limits is not acceptable.

The adoption of measures to restore weight should be agreed upon with the pediatrician. The likelihood that a girl with a problem weight will gradually adjust it herself is small.

5th Percentile Weight

The 5th percentile weight is the lower limit of the minimum allowable weight. There is a lack of weight if the girl’s weight is below this indicator. The 5th percentile weight of a girl at 12 months is 17.6 lb. This is already a critical mark that requires analysis and observation. You need to see a doctor while maintaining a stable weight loss and finding out the reasons for this phenomenon.

95th Percentile Weight

The upper limit of normal weight for a 1 year old girl is 25.1 lb. This is the maximum allowed value. It is already overweight. Obesity starts beyond the upper limit. The 95th percentile weight is a milestone that should not be crossed. Monitor your child’s nutrition more closely if he is close to 25.1 lb. You need to think about adjusting the nutrition if the indicators increase.

What is Considered Obesity for 12 month old?


This is obesity if a girl weighs 25.8 lb or more at 1 year old. It will start outside of the 95th percentile weight. Try to notice in time that the baby is overeating. This will reduce the risk of obesity and quickly restore normal weight. Reaching the maximum weight limit is a clear signal that the weight is overweight.


Boys weighing close to or above 28 lb are already obese. This weight is too big for the age of 12 months. The allowable maximum at that age is the 95th percentile weight. It should not exceed its norm. Obesity can be bad for a boy’s health if left unchecked. Quick action can bring back normal weight and keep it in the middle positions.

Solving the problem of obesity is more difficult if it is heredity. It is impossible to intervene in the genes, but it is realistic to choose the best possible diet. It is better to start it from the moment of the introduction of complementary foods, especially if you notice that the baby is prone to overeating.

Signs That Baby is Not Eating Enough

It is still possible for a child to be malnourished at 12 months. It can manifest itself in different ways and you need to be able to notice the first signs of such a deviation:

  • The child is very thin for a long timeExcessive thinness that does not go away for months speaks of systematic malnutrition.
  • Infrequent stoolsThe number of bowel movements is greatly reduced. The child walks very rarely and little.
  • Small portionsThe child does not eat the prescribed norm of formula, breast milk, or complementary foods. This happens regularly accompanied by weight loss.

Recommendations for Parents and Their Babies

Self-regulation of weight can adversely affect the well-being of the child. Use the recommendations of experts and information from trusted sources. Do not take extreme measures without proper reason. The diet can only be prescribed by a doctor who knows your child, his history, and characteristics of growth and development.

Nutrition and Diet

A child should be eating almost all foods approved by pediatricians by the age of 1 year. Stick to the diet trying to eat at the same time. Don’t feed at night. Children at that age can already do without night snacks. Try to strictly follow the recommendations when prescribing a diet for medical or other reasons. Ask the doctor to choose a different diet for your baby if it does not fit.


The child starts walking at 1 year old. His range of motion is expanding. Dedicate the maximum period of wakefulness to doing exercises to maintain balance in weight. You can scatter toys around the room and ask the baby to collect them from a standing position. Tilts will significantly tire the child. He will sleep and eat well. Visit the pool, develop classes, gymnastics for children. Get a massage if necessary.

Be an example to a child

The lifestyle of parents, and their eating and behavioral habits are completely copied by the child. Set an example if you want the baby to be healthy and strong and his weight to remain stable. It doesn’t take much effort to do this.

Intellectual development

Use the moment if your child shows cognitive activity. You can start learning letters, numbers, colors, shapes, animals, plants, and more at 1 year old. Read more with your baby, study the world around him, tell him poems, and sing songs. Get a manual for the development of intelligence. They will greatly expand your opportunities in teaching a child.

The active work of the brain requires enormous energy costs. A lot of calories are burned, appetite increases, and weight is regulated.

Why Your Baby’s Weight is Not Close to Average

Children do not grow up according to to set standards. They are necessary only to control normal development. Average weight indicators at 12 months may be lower or higher than the established norms. There are many reasons for this.


The inheritance of the phenotype always follows its unpredictable path. If one of the parents is inclined to be overweight, then the child may be born with this sign. Then the average weight will be higher than normal.

Overeating or malnutrition

This is the banal and most obvious reason for excess or lack of weight. Systematic malnutrition leads to a rapid deviation from the average weight norms.

Growth spurt

There may be a decrease in weight during periods of a sharp growth spurt. This visually makes the child more elongated and thin. Standard average weight norms may not be suitable for such drastic changes.

Stop breastfeeding

This is an extremely painful process for both mother and baby. It can be delayed and then the average weight decreases because it is a huge stress. It affects appetite, sleep, routine and more.

The long absence of the mother

The child may begin to feel sad if the mother of the baby is ill or is away from home for a long time. This is a state of closed anxiety. The kid arrives at it unconsciously. The moment of separation is not yet complete and it is difficult for the child to separate himself from his mother. A prolonged absence of a mother knocks down the usual biorhythms and leads to a refusal to eat and weight loss.

Hormonal failures

A wide range of health problems that affect weight includes hormonal imbalances. The work of the thyroid gland and weight gain are tightly interconnected. Deviations from average weight norms are observed when hormonal disruptions occur.

When Should You Worry?

Do not wait until irreversible processes from excess or lack of weight begin. Follow the maximum and minimum allowable weight marks by age. It is better to worry once again and have time to take action than to deal with the consequences later.

You need to see a doctor if your child becomes weak, inactive, sleeps for a long time, and moves little. A possible reason is a malnutrition. Visual signs of malnutrition should be immediately alert. These include peeling and irritation of the skin, leanness, brittle nails and hair, bruising under the eyes, and pale skin.

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