Baby Weight Chart by Age (0–24 Months): Average Weight for Boys & Girls

If you’re here, chances are you’ve been wondering, “Is my baby’s weight normal?” Trust me, you’re not the only one. I remember checking my baby boy’s weight after every vaccination visit and silently comparing it with other babies of the same age.

The truth is, every baby grows differently. Some babies gain weight quickly, while others take their own sweet time. That doesn’t automatically mean something is wrong.

This baby weight chart will help you understand what’s considered an average weight for boys and girls from birth to 24 months. We’ll also talk about what the numbers actually mean, when you should be concerned, and why your baby’s overall growth matters much more than a single reading on the weighing scale.

What Is a Baby Weight Chart?

A baby weight chart is a guide that shows the average weight of babies at different ages. It helps parents and pediatricians monitor a baby’s growth over time and identify any significant changes that may need attention.

Remember, the chart shows average weights, not ideal or target weights. Every baby grows at their own pace, and doctors focus on consistent growth over time rather than a single number.

A baby weight chart can help you:

• Track your baby’s weight as they grow.
• Compare it with the average weight for their age.
• Understand when to discuss any growth concerns with your pediatrician.

Mom Tip: Every baby grows differently, so try not to compare your little one with other babies. Consistent growth is far more important than matching the average weight.

Baby Weight Chart by Age (0–24 Months)

Now that you know what a baby weight chart is, let’s look at the average weight for babies from birth to 24 months.

The charts below are based on the World Health Organization (WHO) Child Growth Standards, which are commonly used by pediatricians to monitor a baby’s growth.

Before you check the table, here’s something I’d really like you to remember. The chart is meant to be a guide, not a report card. If your baby doesn’t match the exact weight shown here, it doesn’t automatically mean something is wrong. Your baby’s growth pattern over time is much more important than one number on the weighing scale.

Note: These values are based on the WHO Child Growth Standards (50th percentile/median) and have been rounded for easier reading. Healthy babies may naturally weigh above or below these averages.

Quick Fact:

Baby boys are usually 100–700 grams heavier than baby girls during the first two years. This difference is completely normal and is already considered in the WHO growth standards.

Is It Okay If My Baby Doesn’t Match the Average Weight?

Don’t worry if your baby’s weight is slightly above or below the average shown in the chart.

Every baby grows at their own pace. Genetics, feeding habits, birth weight, and overall health can all influence your baby’s weight.

The most important thing isn’t the number on the scale – it’s steady growth over time. During routine check-ups, your pediatrician will also use a baby growth chart to track your baby’s weight, length, and head circumference together, giving a more complete picture of their overall growth and development.

Remember: The chart shows average weights, not ideal or target weights. If you have concerns about your baby’s growth, speak with your pediatrician.

What Is the Average Baby Weight at Birth?

One of the very first things everyone asks after a baby is born is, “How much does the baby weigh?” While birth weight is an important indicator of a newborn’s health, there’s a fairly wide range that’s considered normal.

Most full-term babies weigh between 2.5 kg and 4 kg at birth.

On average:

• Baby boys tend to weigh slightly more than baby girls.
• Baby girls are usually a little lighter, but both fall within a healthy range.

It’s also worth remembering that birth weight depends on many factors. Genetics, the length of your pregnancy, your health during pregnancy, and whether your baby was born prematurely can all influence how much your baby weighs at birth.

Is It Normal for Newborns to Lose Weight After Birth?

Yes, and this often surprises first-time parents.

Most newborns lose a small amount of weight during the first few days after birth. This happens because they lose extra fluids and are still learning to feed effectively.

In most cases, babies regain their birth weight within 10 to 14 days once breastfeeding or formula feeding is well established.

Your pediatrician will keep an eye on this during your baby’s newborn check-ups, so there’s usually no need to panic over a small initial weight loss.

How Much Weight Should a Baby Gain Each Month?

Every baby grows at their own pace, but weight gain usually follows a predictable pattern during the first two years.

• Birth to 3 months: This is the fastest growth phase, and babies typically gain weight rapidly.
• 3 to 6 months: Weight gain continues steadily, although it may slow down slightly as babies become more active.
• 6 to 12 months: As babies start solids and become mobile, weight gain becomes more gradual.
• 12 to 24 months: Growth naturally slows during the toddler years, and a slower rate of weight gain is completely normal.

Keep in mind that these are general patterns. Your baby’s feeding, birth weight, genetics, and overall health can all influence how quickly they gain weight.

Want a month-by-month breakdown? Read our detailed guide on Baby Weight Gain by Month to learn how much weight babies typically gain at each stage and what to expect during growth spurts.

What is Baby Growth Percentiles

During routine check-ups, your pediatrician doesn’t just look at your baby’s weight – they also track growth percentiles.

A percentile compares your baby’s weight with other children of the same age and sex. For example, if your baby is in the 25th percentile, it simply means that about 25 out of 100 babies weigh less and 75 weigh more. It doesn’t mean your baby is underweight or unhealthy.

What matters most is that your baby follows a steady growth pattern over time rather than staying at a specific percentile.

Want to learn more? Read our detailed guide on Understanding Baby Growth Percentiles to find out how percentiles work and what they mean for your baby’s growth.

What Factors Affect a Baby’s Weight?

It’s natural to compare your baby with others, but remember that every baby grows differently. Several factors can influence your baby’s weight, including:

• Genetics: Babies often inherit their body type from their parents.
• Birth weight: Babies born smaller or larger may continue following their own growth pattern.
• Feeding: Whether your baby is breastfed or formula-fed, healthy growth is possible with proper nutrition. (Learn more: Breastfed vs Formula-Fed Baby Weight.)
• Premature birth: Preterm babies may have a different growth pattern during the first few months.
• Growth spurts: Babies often feed more and gain weight rapidly during growth spurts.
• Activity level: As babies start rolling, crawling, and walking, weight gain naturally becomes more gradual.

Rather than comparing your baby’s weight with others, focus on steady growth over time. If you notice a sudden slowdown or have concerns about your baby’s weight, consult your pediatrician.

Signs Your Baby Is Growing Healthy

While your baby’s weight is important, it’s only one part of the picture. Pediatricians also look at your baby’s overall growth, feeding, development, and growth percentiles to understand whether your little one is growing consistently over time.

Here are some reassuring signs that your baby is growing as expected:

• Gaining weight steadily over time.
• Feeding well and appearing satisfied after most feeds.
• Having the expected number of wet and dirty diapers.
• Being active, alert, and curious about their surroundings.
• Reaching age-appropriate developmental milestones.
• Following a consistent growth percentile during routine check-ups.

Every baby grows at their own pace, so try not to compare your little one with other babies of the same age.

Remember: Doctors don’t expect every baby to be in the same percentile. A baby who consistently follows the 25th percentile can be just as healthy as one in the 75th percentile. What matters most is steady growth over time, not reaching a particular number.

When Should You Be Concerned About Your Baby’s Weight?

Every baby grows at their own pace, so it’s normal to see small variations in weight gain. A single weight measurement doesn’t usually tell the whole story.

However, it’s a good idea to speak with your pediatrician if your baby:

• Isn’t gaining weight consistently over multiple check-ups.
• Drops significantly on their growth percentile over time.
• Has difficulty breastfeeding or bottle-feeding.
• Vomits frequently or struggles to keep feeds down.
• Shows signs of dehydration, such as fewer wet diapers than usual.
• Seems unusually sleepy, weak, or uninterested in feeding.

Your pediatrician will assess your baby’s growth pattern, feeding habits, overall health, and development before determining whether there’s a cause for concern. If you’re ever worried about your baby’s weight gain, don’t hesitate to speak with your pediatrician. Early guidance can help address any feeding or growth concerns and give you peace of mind.

If your baby needs extra support with weight gain, read our detailed guide on How to Support Healthy Weight Gain in Babies for practical feeding tips, age-appropriate nutrition, and advice on when to seek medical help.

Common Myths About Baby Weight

As parents, we’re often surrounded by advice from family, friends, and social media. While most of it comes from a good place, not everything you hear is true. Here are some common myths about baby weight and the facts behind them.

Remember: Every baby’s growth journey is unique. Instead of comparing numbers with other babies, track your baby’s progress over time and discuss any concerns with your pediatrician.

Conclusion

Every baby grows at their own pace, so don’t let a single number on the weighing scale become a source of stress. Use this baby weight chart as a guide to track your little one’s growth over time, rather than comparing them with other babies.

If your baby is feeding well, staying active, and growing consistently, you’re already on the right track. And if you ever have concerns about your baby’s weight, your pediatrician is the best person to guide you.

Frequently Asked Questions

1. What is the normal weight of a newborn baby?

Most full-term newborns weigh between 2.5 kg and 4 kg at birth, although babies slightly below or above this range can also be healthy.

2. How much should a 3-month-old baby weigh?

The ideal weight depends on your baby’s sex and growth pattern. Refer to the WHO baby weight chart, as healthy babies can fall within different weight ranges.

3. Is it normal for babies to lose weight after birth?

Yes. Most newborns lose a small amount of weight during the first few days and usually regain their birth weight within 10 to 14 days.

4. How often should I weigh my baby?

Your baby’s weight is typically checked during routine pediatric visits and vaccination appointments. Frequent weighing at home is usually unnecessary unless advised by your doctor.

5. Should I compare my baby’s weight with other babies?

No. Every baby grows at their own pace, so it’s better to track your baby’s growth over time rather than comparing them with other children.

6. What is a healthy weight for a baby?

A healthy baby weight varies by age, sex, and individual growth pattern, so it’s best assessed using the WHO growth chart and your baby’s growth over time.

7. How do I calculate my baby’s weight?

You don’t calculate your baby’s weight – you simply weigh your baby on an accurate infant scale and compare it with the WHO baby weight chart for their age and sex.

8. Is 7 kg normal for a 3-month-old baby?

A weight of 7 kg can be normal for some 3-month-old babies, especially boys, but your pediatrician will assess it along with your baby’s length and overall growth pattern.

9. What is a low weight of a baby in kg?

There’s no single weight that’s considered “low” for all babies, as it depends on age, sex, and gestational age. A pediatrician uses growth charts to determine whether a baby’s weight is appropriate.