My Baby is Gaining Less Weight, Why? Understanding the Causes and Solutions

As a parent, watching your baby grow is a joyous and exciting experience. However, when your baby is not gaining weight as they should, it can be a cause for concern. There are many factors that can contribute to a lack of weight gain in babies, and it’s essential to understand why this is happening to determine the best course of action. In this article, we will explore the common causes of weight loss in babies and provide practical solutions to help your little one reach their full potential.
- Common Causes of Weight Loss in Babies
- Practical Solutions to Help Your Baby Gain Weight
- My Baby is Gaining Less Weight: What Could be the Causes?
- What is the Baby’s First Year Weight?
- Follow the Growth Chart!
- What to do if Your Baby is Not Gaining Weight?
- What are the Ways to Increase Your Baby’s Appetite?
- My Baby’s Weight Gain Has Been Slowed, Why?
- Conclusion
- References
- Frequently Asked Questions (FAQ) about My Baby is Gaining Less Weight, Why?
Common Causes of Weight Loss in Babies
There are several reasons why a baby may not be gaining weight as expected, including:
- Medical conditions: Some medical conditions can interfere with a baby’s ability to gain weight. These conditions can include gastroesophageal reflux disease (GERD), food allergies, and celiac disease. If your baby has any of these conditions, it is essential to seek medical advice to determine the best course of action.
- Feeding issues: If your baby is not feeding well, they may not be getting enough milk or formula to support their growth. Issues such as a poor latch, nipple confusion, and oral motor problems can all contribute to feeding difficulties.
- Slow metabolism: Just like adults, some babies have a slower metabolism, which means they may not gain weight as quickly as others.
- Inadequate calorie intake: If your baby is not consuming enough calories, they will not gain weight as expected. This can occur if your baby is not feeding frequently enough or if they are not getting enough milk or formula during each feeding.
- Illness: If your baby is sick, they may not have an appetite and may not be gaining weight as they should.
Practical Solutions to Help Your Baby Gain Weight
If you are concerned that your baby is not gaining weight as they should, there are several steps you can take to help. These include:
- Seek medical advice: If you suspect your baby has a medical condition that is contributing to their lack of weight gain, it is essential to seek medical advice. Your doctor may recommend further testing or a change in diet to help your baby gain weight.
- Work on feeding techniques: If your baby is not feeding well, it is essential to work on improving their latch and feeding techniques. Your doctor may recommend seeing a lactation consultant to help with this.
- Increase calorie intake: If your baby is not consuming enough calories, you may need to increase their milk or formula intake. Your doctor may recommend supplementing with additional feedings or a different type of formula.
- Watch for signs of illness: If your baby is sick, it is essential to watch for signs that their illness is affecting their weight gain. If this is the case, it is important to seek medical advice.
- Monitor your baby’s growth: Regular monitoring of your baby’s growth will help you determine if they are gaining weight as they should. Your doctor may recommend tracking their weight and length and plotting it on a growth chart to see if there are any concerns.
My Baby is Gaining Less Weight: What Could be the Causes?
As a parent, watching your baby not gain weight can be a worrying experience. If your baby is not gaining weight, it’s important to understand the potential causes so you can take appropriate action. There are several factors that could be contributing to your baby’s weight loss, including:
Medical Conditions
Some medical conditions such as allergies, infections, and digestive problems can cause weight loss in babies. For example, conditions such as celiac disease, cow’s milk protein intolerance, and gastroesophageal reflux disease (GERD) can lead to weight loss by affecting the baby’s ability to absorb nutrients and digest food properly. If you suspect that your baby may have a medical condition, it’s important to seek medical advice.
Feeding Issues
Feeding issues such as poor latch, nipple confusion, and oral motor problems can also contribute to weight loss in babies. Improper feeding techniques can result in babies not getting enough milk or formula, which can lead to weight loss. In such cases, working with a lactation consultant can help resolve feeding issues and improve weight gain.
Slow Metabolism
Just like adults, some babies have slower metabolisms, which can result in weight loss. However, this is a less common cause of weight loss in babies compared to other factors such as feeding issues and medical conditions.
Inadequate Calorie Intake
Inadequate calorie intake can also cause weight loss in babies. If your baby is not getting enough milk or formula, they may not be getting enough calories to support growth and development. To ensure your baby is getting enough calories, it’s important to monitor their feedings and seek advice from your doctor if necessary.
Illness
Illness can also affect a baby’s weight gain. If a baby is sick, they may not have an appetite and may not be gaining weight as they should. It’s important to watch for signs of illness and seek medical advice if necessary.
Genetics
Finally, genetics can also play a role in a baby’s weight gain. Some babies may be born with a smaller frame and slower metabolism, which can result in slower weight gain. However, genetics should not be a major concern as long as the baby is growing and developing normally.
In conclusion, there are many factors that can cause weight loss in babies, and it’s important to understand these factors so you can take appropriate action. If you are concerned about your baby’s weight gain, it’s important to seek medical advice. Regular monitoring of your baby’s growth and development can also help you determine if there are any concerns.
What is the Baby’s First Year Weight?
The first year of a baby’s life is a time of rapid growth and development. During this time, it’s important to monitor the baby’s weight to ensure they are on track for healthy growth. In general, babies should be gaining weight steadily during their first year, but the exact amount of weight gain can vary from baby to baby.
Average Weight Gain in the First Year
According to the World Health Organization (WHO), the average weight gain for babies during their first year is approximately 5-7 pounds per month for the first six months, and then 3-5 pounds per month for the next six months. By the end of their first year, most babies will have gained between 10-15 pounds, with some babies gaining as much as 20 pounds.
Factors that Affect Weight Gain
There are several factors that can affect a baby’s weight gain during their first year, including:
- Genetics: Some babies are born with a slower metabolism and may not gain weight as quickly as others.
- Feeding: The amount and frequency of feedings can affect weight gain. If a baby is not getting enough milk or formula, they may not be gaining weight as they should.
- Health: If a baby is sick, they may not have an appetite and may not be gaining weight as they should.
- Gender: Boys tend to gain weight faster than girls during their first year.
Monitoring Weight Gain

It’s important to monitor a baby’s weight gain during their first year to ensure they are growing and developing as they should. The doctor will measure the baby’s weight, length, and head circumference at each well-child visit, and use growth charts to track their progress. If the baby is not gaining weight as they should, the doctor may suggest changes to the baby’s diet or lifestyle to help support healthy growth.
In conclusion, the baby’s first year weight can vary from baby to baby, but on average, they should be gaining weight steadily during their first year. By monitoring the baby’s weight and seeking medical advice if necessary, parents can help ensure their baby is on track for healthy growth and development.
Follow the Growth Chart!
One of the best ways to monitor a baby’s weight gain during their first year is to follow the growth chart. The growth chart is a tool that tracks a baby’s weight, length, and head circumference over time, and helps parents and doctors determine if the baby is growing and developing as they should.
Why is the Growth Chart Important?
The growth chart is important because it provides a visual representation of a baby’s growth over time. By comparing the baby’s measurements to the growth chart, parents and doctors can determine if the baby is growing and developing at a healthy rate. If the baby’s measurements are outside of the expected range, the doctor may investigate the cause and make recommendations to help the baby get back on track.
How to Use the Growth Chart
To use the growth chart, simply bring it to each well-child visit and have the doctor measure the baby’s weight, length, and head circumference. The doctor will then plot the measurements on the growth chart to determine if the baby is growing and developing as they should.
For the first 6 months, you can track your baby’s weight and height with our “Height-Weight Chart for Boys and Girls“.
When to be Concerned
If the baby’s measurements fall below the expected range on the growth chart, the doctor may investigate the cause and make recommendations to help the baby get back on track. Some common causes of low weight gain include illness, insufficient milk or formula intake, and food allergies. If the doctor determines that the baby is not gaining weight as they should, they may recommend changes to the baby’s diet, lifestyle, or medical treatment to help support healthy growth.
In conclusion, the growth chart is a valuable tool for monitoring a baby’s weight gain during their first year. By following the growth chart and seeking medical advice if necessary, parents can help ensure their baby is on track for healthy growth and development.
What to do if Your Baby is Not Gaining Weight?
If your baby is not gaining weight despite having access to milk, it’s important to seek medical advice. The doctor may investigate the cause and make recommendations to help support healthy weight gain. Some of the most common recommendations include:
- Increasing Milk Intake: The doctor may suggest ways to increase the baby’s milk intake, such as increasing the frequency of feedings, trying different feeding positions, or supplementing with formula.
- Treating Health Issues: If the baby is sick, the doctor may recommend medical treatment to help them recover and start gaining weight again.
- Monitoring Allergies: If the baby has food allergies, the doctor may recommend avoiding certain foods or switching to a hypoallergenic formula.
In conclusion, if your baby is not gaining weight despite having access to milk, it’s important to seek medical advice and investigate the cause. With the right support, most babies can get back on track for healthy weight gain and continue to grow and develop as they should.
What are the Ways to Increase Your Baby’s Appetite?

It can be concerning for parents to see their baby not gaining weight as expected, especially if they have access to milk. In these cases, it may be necessary to try different strategies to increase the baby’s appetite and support healthy weight gain.
Offer Feedings More Frequently
One of the simplest ways to increase a baby’s appetite is to offer feedings more frequently. This can help ensure that the baby is getting enough milk to support healthy weight gain, and can also help stimulate the baby’s appetite.
Try Different Feeding Positions
Some babies may be more comfortable and willing to eat in certain positions. Experimenting with different positions, such as cradling, side-lying, or sitting, can help encourage the baby to eat and support healthy weight gain.
Offer Small, Frequent Feedings
Offering small, frequent feedings can help ensure that the baby is getting enough milk to support healthy weight gain. This can be especially helpful for babies who may have trouble eating large amounts at once.
Provide a Calm, Relaxing Environment
Creating a calm and relaxing environment during feedings can help the baby feel more comfortable and willing to eat. This can include turning off lights and electronics, and reducing noise and distractions during feedings.
Experiment with Different Foods
Some babies may be more willing to eat when offered different foods. Experimenting with different formulas, purees, or solids can help encourage the baby to eat and support healthy weight gain.
In conclusion, there are several ways to increase a baby’s appetite and support healthy weight gain, including offering feedings more frequently, trying different feeding positions, offering small, frequent feedings, providing a calm and relaxing environment, and experimenting with different foods. If you are concerned about your baby’s weight gain, it’s important to seek medical advice and work with the doctor to find the best strategy for your baby.
My Baby’s Weight Gain Has Been Slowed, Why?

It can be concerning for parents when they notice that their baby’s weight gain has slowed down. There can be several reasons why this may occur, and it’s important to understand the potential causes and what steps can be taken to support healthy weight gain.
Illness or Medical Condition
One of the most common reasons for slowed weight gain in babies is illness or a medical condition. This can include conditions such as an ear infection, a respiratory illness, or a gastrointestinal issue. If your baby has been sick, it’s important to seek medical advice and work with the doctor to determine the best course of action.
Nutritional Deficiencies
Another potential reason for slowed weight gain in babies is nutritional deficiencies. This can include deficiencies in vitamins and minerals, such as iron or vitamin D, or a lack of sufficient calories to support healthy weight gain. If you are concerned about your baby’s nutrition, it’s important to seek advice from a pediatrician or a dietitian.
Slow Feeding Pattern
Some babies may have a slow feeding pattern, which can contribute to slowed weight gain. This can include difficulties latching, a preference for snacking rather than eating large amounts at once, or a slow metabolism. If you are concerned about your baby’s feeding pattern, it’s important to seek advice from a lactation consultant or a pediatrician.
Overfeeding or Force Feeding
It’s also possible for a baby’s weight gain to be slowed as a result of overfeeding or force feeding. This can occur when the baby is being offered more milk than they are able to consume, or when they are being forced to eat even if they are not hungry. If you are concerned about your baby’s feeding patterns, it’s important to seek advice from a pediatrician.
Genetics
Finally, genetics can also play a role in a baby’s weight gain. Some babies may have a slower metabolism or a genetic predisposition to slower weight gain. If you have concerns about your baby’s weight gain, it’s important to seek medical advice and work with the doctor to determine the best course of action.
In conclusion, there are several potential reasons why a baby’s weight gain may be slowed, including illness or a medical condition, nutritional deficiencies, a slow feeding pattern, overfeeding or force feeding, and genetics. If you are concerned about your baby’s weight gain, it’s important to seek medical advice and work with the doctor to determine the best course of action.

Conclusion
My Baby is Gaining Less Weight, Why? is a common question asked by parents. There are many factors that can contribute to weight loss in babies, including medical conditions, feeding issues, slow metabolism, inadequate calorie intake, and illness. Seeking medical advice and working on practical solutions such as improving feeding techniques and increasing calorie intake can help your baby reach their full potential. Regular monitoring of your baby’s growth will also help you determine if there are any concerns. If you are concerned about your baby’s weight gain, it is important to take action and seek the necessary support.
Breast milk or formula milk is required for your baby during the first 6 months of feeding. For the first 6 months of your baby’s nutrition, you can review our “0-6 Months Baby Nutrition” article.
As your baby approaches his first year, the importance of solid foods increases. If your baby appears to be gaining weight, feed solid foods first, then breast milk or formula milk. You might find our article on “6 months baby nutrition” interesting.
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References
- American Academy of Pediatrics. (2017). Your baby’s growth: What’s normal. https://www.healthychildren.org/English/ages-stages/baby/pages/Your-Babys-Growth-Whats-Normal.aspx
- World Health Organization. (2021). Growth standards for infants and young children. https://www.who.int/childgrowth/standards/en/
- Mayo Clinic. (2021). Vitamin D for infants and children. https://www.mayoclinic.org/healthy-lifestyle/infant-and-toddler-health/in-depth/vitamin-d-for-infants/art-20047097
- Nemours Kids Health. (2021). Growth & Development: Birth to 3 months. https://kidshealth.org/en/parents/growth3mo.html
- La Leche League International. (2021). Slow Weight Gain in Breastfed Babies. https://www.llli.org/breastfeeding-info/slow-weight-gain-in-breastfed-babies/
- Centers for Disease Control and Prevention. (2021). Growth charts: What they tell you about your baby’s size. https://www.cdc.gov/growthcharts/percentile_data_files.htm
- American Academy of Pediatrics. (2020). Iron-rich foods for your baby. https://www.healthychildren.org/English/ages-stages/baby/feeding-nutrition/Pages/Iron-Rich-Foods-For-Your-Baby.aspx
- American Pregnancy Association. (2021). Increasing Your Baby’s Appetite. https://americanpregnancy.org/first-year-of-life/increasing-your-babys-appetite/
Frequently Asked Questions (FAQ) about My Baby is Gaining Less Weight, Why?
Why is my baby not gaining weight?
There are several reasons why a baby may not be gaining weight, including not getting enough milk, a slow metabolism, and certain medical conditions. It’s important to consult a doctor to determine the underlying cause.
How do I know if my baby is gaining enough weight?
You can track your baby’s growth by monitoring their weight and length and comparing it to the World Health Organization’s growth chart. Your doctor can also help you determine if your baby is gaining weight at a healthy rate.
What can I do to increase my baby’s weight gain?
You can try increasing your baby’s calorie intake by offering more frequent feedings or switching to formula, as well as ensuring they get enough vitamins and minerals, such as iron and vitamin D. Consult your doctor for personalized recommendations.
Can a lack of iron cause slow weight gain in babies?
Yes, a lack of iron can contribute to slow weight gain in babies. Make sure your baby is getting enough iron through their diet or supplements as recommended by a doctor.
What if my baby is not gaining weight even though they are breastfeeding?
If your baby is not gaining weight despite breastfeeding, it may be due to a low milk supply or an inefficient latch. Consult a lactation consultant to determine the cause and develop a plan to increase your baby’s weight gain.
Is it normal for some babies to gain weight slower than others?
Yes, every baby is different and some may gain weight slower or faster than others. As long as your baby is following the growth chart and your doctor is not concerned, there is no cause for worry.
Can a baby’s weight gain slow down in the first year?
Yes, a baby’s weight gain can slow down during their first year as they become more active and start eating solid foods. It’s important to continue monitoring their growth and consulting a doctor if there are any concerns.
How important is it to follow the growth chart for my baby’s weight gain?
Following the growth chart is important as it helps you and your doctor track your baby’s growth and ensure they are gaining weight at a healthy rate.
What if my baby is gaining weight too quickly?
In some cases, rapid weight gain can indicate a health issue, such as an overactive thyroid. Consult a doctor if you suspect your baby is gaining weight too quickly.
Can I give my baby supplements to help with weight gain?
Consult a doctor before giving your baby any supplements. They can recommend the appropriate dosage and ensure it does not interfere with any other medical conditions your baby may have.
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