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Average Weight of 3 Month Old

Controlling the weight of an infant for up to 1 year is a mandatory process. Pediatricians insist on constant weighing to monitor weight gain. This allows you to keep track of the development of the baby and regulate nutrition.

Weight has always been one of the main indicators of development in the first year of life. The child is calm, developed, and sleeps well if he eats well. Any serious deviation from the norm in weight entails many consequences. Some of them seriously affect the health of the baby.

It is the responsibility of the mother and pediatricians to monitor the norms of average weight by age. Weight indicators are different for all children. Sometimes they deviate from the accepted norms by quite significant figures. This doesn’t always have to be a cause for concern.

The average weight of 3 month old baby

A baby’s weight at 3 months has increased by almost 5.5 lbs since birth. Sometimes these data are below the norm. The average weight of a three-month-old girl is 12.1 lb. The average weight for boys is 13.2 lb.

3 Month Old Baby Weight

Accepted standards and norms of weight by age should not keep you in fear. Shifts in averages can be justified by quite obvious and harmless reasons. Every child is unique in their growth and development. Weight gain in children is proceeding at its own pace.

Every Baby has Different Weight

All babies are born with a certain weight that no one can predict. This leads to the fact that the indicators taken as the norm do not correspond to many real parameters. Individual weight gain will be based on genetics, lifestyle, disease, and other factors. Each child has a weight that needs to be controlled for up to 1 year.

Factors affecting weight

Factors that affect weight include genetics, ethnic characteristics, health, nutrition, adherence to the regime, and so on. These moments are numerous. All of them make their adjustments to the weight gain and cause deviations from the average norms.

Don’t worry ahead of time. The baby can gain weight at its usual pace. The main thing is that the recruitment norms for the month are observed. There is no cause for concern if the indicators do not go beyond the lower and upper acceptable values. Weight after birth can be adjusted. You can enter the mixture with a lack of weight during breastfeeding. Reduce the volume of milk at one time with excess weight.

How Much Boys Weight at 3 month Old

Boys are born larger than girls. The weight of the baby by the age of three months can be from 10.5 lb to 16.3 lb. The upper and lower limits of the norm determine whether there are deviations in development. Diet or additional nutrition in the form of a mixture is prescribed if necessary.


The average weight of a three-month-old boy according to international standards is 13.2 lb. This figure may be different. If the initial weight was less than the standard norm, then by 3 months the data will be lower than accepted.

Average rates are indicated taking into account weight loss after birth. Newborns can lose up to 10% of their original weight during their stay in the hospital. This is quickly restored by a good mass gain for each day. Weight problems should not be with properly organized nutrition.

5th Percentile Weight

The lower limit of normal weight according to the CDC for a three-month-old boy is 9.7 lb. This is severe underweight if the available data is well below the 5th percentile weight. It is worth deciding on the restoration of lactation and the introduction of the mixture in such a situation.

A slight excess of the 5th percentile weight is not significant. Since the limits of the norm cover a wide range of data. The main thing is not to go beyond the upper limit.

95th Percentile Weight

The 95th percentile weight is the upper limit of normal. This indicator for a boy at 3 months is 16.3 lb. This is the limit beyond which obesity goes. If your baby is gaining more than the 95th percentile in terms of height and weight, then a serious nutritional adjustment and even a diet are required.

Being overweight has never helped anyone in life. It causes many health problems. It is just as dangerous for a small child as it is for an adult.

How Much Girls Weight at 3 month Old

The weight of girls at 3 months is within the range between 9.7 lb and 14.7 lb. These are the limits of the norm beyond which there will be obvious deviations – underweight or excess body weight. Girls are statistically born smaller, but this is not necessary. Each case is individual. Weight control should be carried out taking into account the parameters of a particular child.


The average weight of a three-month-old girl is 12.1 lbs. These standards are set based on general data including birth weight loss. The baby will gain about 1 ounce each day. Girls are gaining between 1.3 lbs and 2.2 lbs per month at this rate. Then the weight gain will decrease slightly.

Compliance with the average weight of 3 months is not necessary. It is much more important that the weight of the baby does not go beyond the lower and upper limits.

5th Percentile Weight

The lower limit of normal weight for a three-month-old girl is 9.7 lb. Anything below this indicator will indicate a severe nutritional deficiency and underweight. This situation can be observed with a lack of milk from the mother. An immediate adjustment of nutrition and the introduction of a mixture are required.

The baby should gain at least 5 pounds by 3 months from birth. It is necessary to take action if the weight is added very slowly and is less than 1 lb per month.

95th Percentile Weight

The upper limit of normal weight for girls 3 months old is 14.7 lb. If the figures are much higher than the data of the 95th percentile weight, then obesity begins. Excess body weight can lead to a lot of unpleasant consequences for the health of the baby. A timely sparing diet and constant weight control are necessary.

The limits of the upper norm can already be considered overweight. Each pediatrician treats WHO data differently. The appearance of the baby, as well as his condition, is taken into account.

What is Considered Obesity for 3 month old?


You can talk about obesity with a significant excess of the 95th percentile weight. It is worth worrying when the weight goes far beyond the established upper limit of the norm. Such weight in girls of 3 months can be considered an indicator of more than 15.2 lb. Excess weight will be visually noticeable immediately. Immediate measures must be taken to correct nutrition to prevent obesity.


The critical weight data for the upper limit are higher for boys than for girls. A 3 month old boy weighing over 16.7 lb would be considered the onset of obesity according to the CDC. This figure is more than the limits of the highest norm. Obesity is considered to be all data above the 95th percentile weight. It is the boundary between being overweight and obese.

The most important thing in diagnosing obesity is to identify its causes. Possible causes include overnutrition, health problems, disruption, lack of mobility, and genetics. It is impossible to say who is more prone to obesity boys or girls. Such a pattern is not observed.

Signs That Baby is Not Eating Enough

Parents at 3 months well adapted to the regimen of their baby. Weight control and nutrition adjustments are being made. You can understand that the baby is malnourished by several proven signs:

  • A number of wet diapersA three-month-old baby should have at least 6 wet diapers per day. The baby is malnourished if there are much fewer of them.
  • Lethargy and reduced activity of the babyThe baby will lose strength when there is not enough milk. Fatigue accumulates and activity decreases.
  • The breast is not pouredThe mother should have plenty of milk in the first months. The breast fills up and becomes hard and softens after feeding. There is a shortage of milk if this does not happen.

Recommendations for Parents and Their Babies

All possible recommendations and advice for parents will depend on the presence of a problem. With an excess of weight, they will be one and with a lack of others. Each child is individual and his weight can differ significantly from the standard norms. Follow what your pediatrician says for a quality recommendation. Independent obtaining of information is acceptable only from trusted sources.

Nutrition and Diet

Your child’s weight can be anything within the upper and lower limits. Everything that is beyond the scope requires nutritional adjustments. Excess weight should be controlled by diet. It cannot be too strict and restrictive. Gradually reduce the amount of milk per meal. Sometimes a mixture change or a significant reduction is required. Do everything possible to improve lactation and enter the mixture when there is a shortage of milk.


It is necessary to keep the baby’s motor activity to maintain a normal weight. A child at 3 months old can already begin to roll over. Constantly do flip exercises with him. Don’t rule out massage and light stretching. Help your baby reach for toys and try to crawl. Lay your baby on your stomach more often. Physical exercise will help maintain balance in weight gain.

Save the schedule

Try to follow a specific daily schedule. This regime will be closely associated with sleep for up to a year. Establish a schedule and do not deviate from the accepted norms of daily sleep. A well-rested baby will eat well and be active. He will wake up less often and thus keep a stable weight.

Start from the womb

All your habits during the period of gestation are fixed by the child. The way of life of the mother in many ways influences the child. It is projected and remembered by the baby when he is in the womb. The right habits will help the child maintain a stable weight within the normal range. Get early help for your child.

Why Your Baby’s Weight is Not Close to Average

You must understand that the weight of the baby is not required to strictly comply with accepted standards. This will make it a little easier for you to relate to the CDC standards. Only the critical upper and lower limits of the allowable weight are important. Deviations from the average are not caused for panic.

Improper nutrition of the mother

If the mother ate poorly during the gestation period, this can lead to further obesity in the baby. We are talking about an excess of harmful and fatty foods and hunger. The child remembers information about a possible nutritional deficiency and in the future tries to eat more so as not to feel hungry.

Low mobility

Deviation from the average weight norms may be due to the low mobility of the baby and then the weight increases significantly. Children 3 months old should be in constant motion during the waking period.


Parents who tend to be overweight will have the same child. This is heredity. If everyone in the family is thin and small, then the inherited signs of the baby will be the same.

Regular mode crashes

Appetite is disturbed when the diet goes astray. The baby can either refuse milk or absorb it in large quantities. Children often begin to eat a lot at night. This is fraught with excess weight gain.

Mistakes when introducing the mixture

Sometimes the introduction of a mixture is unreasonable. An overabundance of nutrition occurs in this case and the baby is rapidly gaining weight. There are serious deviations from the average norms. The help of a specialist is required in such a situation.

Lack of milk in the mother

Controlling a woman’s milk supply is not easy. Inexperienced mothers sometimes think that everything is in order. The child eats at the breast, during periods of sleep, and is calm, but the baby does not reach the norm of weight per month and gradually loses weight. There are deviations from the average norms to the smaller side.

When Should You Worry?

It is not worth worrying ahead of time about the weight of your child. Several points should alert you. It happens that a baby at 3 months constantly wakes up at night and asks for food. You give him breast or formula and the number of meals per night is not reduced. This may lead to further obesity. Night feedings should decrease with age and disappear altogether by the first year of life.

You should see a doctor if your baby’s appearance changes a lot. Symptoms such as hair loss, extensive skin peeling, and excessive thinness are not the norm. The same applies to the visual increase in body weight. It is worth worrying if the child looks much larger than his peers and the size of clothes at 3 months as at 8 months.

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