What’s the Average Baby Weight by Month?

As a new parent, it’s natural to wonder if your baby is growing and developing properly. One way to track your baby’s growth is by monitoring its weight. Here, we’ll take a look at what’s considered average baby weight by month, what to expect from weight gain in babies, and why baby weight is important.

Understanding baby size

Understanding baby size is an important aspect of a baby’s growth and development. A baby’s size can be measured in different ways, such as length, head circumference, and weight. It is essential for parents to understand their baby’s growth patterns to ensure that their baby is developing healthily and to monitor any concerns that may arise.

During pregnancy, ultrasounds can be used to estimate the baby’s size and monitor growth. After birth, a baby’s weight and length are measured, and these measurements are used to determine if the baby is growing properly. Babies grow and develop at different rates, so it is important to focus on the overall trend of growth rather than any individual measurements.

The first few months of a baby’s life are a critical period for growth and development. In the first month, babies typically lose a little weight before gaining it back and starting to grow. By the end of the first month, babies typically gain about 1.5 to 2 pounds.

By the end of the second month, most babies have gained about 3 to 5 pounds and have grown about 2 to 3 inches in length. By the end of the third month, babies have typically gained about 1 to 2 pounds per month and grown about 1 inch per month.

After the first few months, babies continue to grow and develop at a rapid pace. By six months, most babies have doubled their birth weight, and by one year, most babies have tripled their birth weight. By the end of the first year, most babies have grown about 10 inches in length.

Chart of average weights

Here is a chart of average weights for babies by month:

MonthBoys’ Average WeightGirls’ Average Weight
Birth7.4 lbs (3.4 kg)7.2 lbs (3.3 kg)
19.4 lbs (4.3 kg)8.8 lbs (4.0 kg)
211.6 lbs (5.3 kg)10.8 lbs (4.9 kg)
313.5 lbs (6.1 kg)12.7 lbs (5.8 kg)
415.4 lbs (7.0 kg)14.5 lbs (6.6 kg)
516.8 lbs (7.6 kg)15.7 lbs (7.1 kg)
618.2 lbs (8.3 kg)17.4 lbs (7.9 kg)
719.0 lbs (8.6 kg)18.2 lbs (8.3 kg)
820.2 lbs (9.2 kg)19.6 lbs (8.9 kg)
921.2 lbs (9.6 kg)20.4 lbs (9.3 kg)
1022.4 lbs (10.2 kg)21.4 lbs (9.7 kg)
1123.1 lbs (10.5 kg)22.0 lbs (10.0 kg)
1224.0 lbs (10.9 kg)22.9 lbs (10.4 kg)

It’s important to remember that these are just averages and that there is a wide range of what is considered a healthy weight for babies. Factors such as genetics, nutrition, and overall health can all play a role in determining a baby’s weight. Weight percentiles can help doctors track a baby’s growth and development over time.

Weight percentiles explained

Weight percentiles are a way to track a baby’s growth and development over time. They are used to compare a baby’s weight to other babies of the same age and gender and are a useful tool for doctors and parents to monitor a baby’s growth and ensure that they are healthy and developing at a normal rate.

A weight percentile is a ranking of a baby’s weight compared to other babies of the same age and gender. For example, if a baby is in the 50th percentile for weight, it means that half of all babies their age and gender weigh less than them, and half weigh more.

Weight percentiles are based on growth charts that are developed by the World Health Organization (WHO) and the Centers for Disease Control and Prevention (CDC). These growth charts are based on data from thousands of babies and are updated regularly to reflect changes in the population.

It’s important to note that weight percentiles are just one way to track a baby’s growth and development. They should be used in conjunction with other measurements, such as height and head circumference, and with a baby’s overall health and well-being in mind.

A baby who is in the 5th percentile for weight but is otherwise healthy and meeting developmental milestones may not be a cause for concern, while a baby who is losing weight and falling off the growth chart may require medical attention.

Parents should discuss any concerns about their baby’s growth and development with their pediatrician, who can help interpret weight percentiles and other growth measurements and recommend any necessary interventions.

What to expect from weight gain in babies

Weight gain is an important part of a baby’s development. During the first year, babies typically triple their birth weight. Here’s what you can expect in terms of weight gain during different stages of a baby’s first year:

  • During the first month, babies typically gain 5-7 ounces per week
  • Between months 1-3, babies typically gain 1-2 pounds per month
  • Between months 4-7, babies typically gain 1 pound per month
  • Between months 8-12, babies typically gain 1/2 pound per month

It’s important to remember that these are just general guidelines, and every baby is different. Some babies may gain weight more quickly or slowly than others. As long as your baby is growing steadily, there’s no need to worry.

Breastfed and formula-fed babies may have different growth patterns. Breastfed babies may gain weight more slowly in the first few months but catch up by 6 months. Formula-fed babies may gain weight more quickly in the first few months but then slow down.

If you’re concerned about your baby’s weight gain, talk to your pediatrician. They can help you determine if your baby is growing at a healthy rate and provide guidance if there are any concerns.

Weight in premature babies

Premature babies, or preemies, are infants born before the 37th week of pregnancy. They may have lower birth weights and may require specialized care in the neonatal intensive care unit (NICU). Preemies may also have slower weight gain and growth rates compared to full-term infants, but this can vary depending on the individual baby’s health and medical needs.

According to the March of Dimes, the average weight of a premature baby is about 3.5 pounds (1.6 kilograms). However, preemies can weigh as little as 1 pound (450 grams) and as much as 10 pounds (4.5 kilograms), depending on their gestational age and other factors.

Premature babies require careful monitoring of their weight and growth, as well as specialized care to support their development. Healthcare providers may use specialized growth charts and other tools to track a preemie’s growth and adjust their care as needed. With proper care and support, many premature babies go on to thrive and develop normally.

What factors affect baby weight?

There are several factors that can affect a baby’s weight. These include:

  1. Genetics: Genetics plays a big role in determining a baby’s weight. The size and weight of the parents can influence the baby’s birth weight.
  2. Gestational age: Babies born at 37-42 weeks have a normal birth weight, while babies born before or after this period may have lower or higher birth weights respectively.
  3. Maternal health: A mother’s health during pregnancy can affect the baby’s weight. If the mother has high blood pressure, gestational diabetes, or other health conditions, the baby may have a higher or lower birth weight.
  4. Nutrition: Adequate nutrition during pregnancy is important for the baby’s growth and development. Poor nutrition can result in lower birth weight.
  5. Multiples: Twins, triplets or more babies are usually smaller than single babies because they have to share the same space and nutrition in the mother’s womb.
  6. Maternal age: Babies born to older mothers may have a higher birth weight, while babies born to teenage mothers may have a lower birth weight.
  7. Sex: Boys tend to be heavier than girls at birth.

It’s important to note that a baby’s weight at birth is just one factor in determining their overall health and growth. The baby’s weight, length, and head circumference are regularly monitored by healthcare providers to ensure that they are meeting their developmental milestones.

Why is baby weight important?

Baby weight is important because it is an indicator of growth and development. Adequate weight gain is a sign that the baby is receiving enough nutrition to support healthy growth, both physically and mentally.

Babies who do not gain enough weight may be at risk for developmental delays, including delayed motor skills, speech and language development, and cognitive function. In addition, babies who are underweight may be more susceptible to illness and infection and may have a harder time recovering from illnesses.

On the other hand, babies who are overweight may be at risk for other health problems, including obesity, high blood pressure, and diabetes. It is important for parents and caregivers to monitor their baby’s weight and make sure that they are staying within a healthy range for their age and size.

Regular visits with a healthcare provider can help ensure that your baby is growing and developing as expected and can help identify any potential problems early on.

Health Concerns for underweight babies

Underweight in babies is generally defined as a weight that is below the 10th percentile for a baby’s age and sex. While some babies are naturally smaller and their weight may be within the normal range, an underweight baby may not be getting enough nutrients to support their growth and development. Here are some health concerns associated with underweight babies:

  1. Developmental delays: Lack of proper nutrition can lead to developmental delays in babies. This includes delays in cognitive, motor, and social development.
  2. Weakened immune system: Underweight babies may be more susceptible to infections, as their immune systems may not be functioning properly.
  3. Poor growth: Babies who are consistently underweight may not grow as quickly or as well as their peers.
  4. Organ damage: Lack of proper nutrition can affect the development of important organs such as the brain, heart, and lungs.
  5. Increased risk of chronic diseases: Babies who are underweight may have a higher risk of developing chronic diseases like diabetes, heart disease, and high blood pressure later in life.

It’s important to consult with a healthcare professional if you have concerns about your baby’s weight. They can help assess your baby’s growth and provide guidance on proper nutrition and feeding practices.

Health Concerns for overweight babies

Having an overweight baby can lead to various health concerns, both in the short term and long term. Some of the immediate health risks associated with having an overweight baby include difficulty during delivery, increased risk of developing type 2 diabetes, and breathing problems.

In the long term, an overweight baby may be more likely to develop chronic health conditions such as obesity, heart disease, and type 2 diabetes later in life. Additionally, there is evidence that early childhood weight gain is a predictor of overweight and obesity in adulthood.

If you are concerned about your baby’s weight, it’s important to speak with your healthcare provider. They can provide guidance on appropriate feeding and exercise practices, as well as monitor your baby’s growth and development over time.

What should you do if you’re concerned about your baby’s health?

If you’re concerned about your baby’s health or growth, it’s important to talk to your pediatrician or healthcare provider. They can evaluate your baby’s weight gain and growth, and determine if there are any underlying health concerns or issues that need to be addressed.

In some cases, your healthcare provider may recommend additional testing or interventions, such as blood tests or referrals to a specialist. They may also offer advice on feeding and nutrition and may refer you to a registered dietitian or lactation consultant for additional support.

It’s important to trust your instincts as a parent and to seek medical help if you’re concerned about your baby’s health. With early intervention and support, many health concerns related to baby weight can be successfully addressed, helping your baby to grow and develop to their fullest potential.

Image Credit: Image by Holiak on Freepik

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