What Is Average Weight For 1-Year-Old Boys And Girls?


As babies turn 1 year old, their weights can be very different. Some may weigh more, while others weigh less. Parents often want to know if their 1-year-old’s weight is normal and healthy. Today we will look at the typical weight ranges for 1-year-old boys and 1-year-old girls based on what doctors recommend. Here you learn more about what a healthy weight looks like for 1-year-olds so you can see if your child is right on track.

Average Weight For 1-Year-Old Boys

Watching your baby grow is a joy, isn’t it? By the age of one, most boys will reach an average weight of about 21 pounds 3 ounces (9.6 kg). But hey, remember that babies, just like grown-ups, come in all shapes and sizes.

Here’s a snapshot, based on the adaptation of the World Health Organization’s growth charts for Canada by renowned health organizations.

Age Weight (kg) Weight (lb)
12 Months 8.6 – 10.7 19.0 – 23.5

This is just a ballpark figure. If your little buddy is a bit heavier or lighter, there’s no need to hit the panic button just yet. It’s perfectly normal and as long as your child is healthy and happy, there’s nothing to worry about.

Around this age, babies tend to gain about 1.5 to 2 pounds each month. So don’t be surprised if your little guy starts to put on a little weight. But once they hit the 6-month mark, their weight gain starts to slow down slightly.

Average Weight For 1-Year-Old Girls

Now let’s flip the coin and talk about the little girls. For 1-year-old girls, the average weight is around 19 pounds 10 ounces (8.9 kg). But remember, not all tots will fit neatly into the average; it’s common to see a weight range from about 17 to 24 pounds.

The growth rate isn’t a constant figure either. On hitting six months, most girls average around 16 pounds 2 ounces (7.3 kg), nearly doubling their birth weight. Following the half-year mark, the weight gain takes a bit of a chilled-out route, slowing down slightly.

Factors Affecting the Average Weight of 1-Year-Old Children

The average weight of a 1-year-old child can vary depending on several factors. Here’s a breakdown of some key influences:

Prenatal factors:

  • Gestational age: Babies born prematurely tend to be smaller than those born at full term. Conversely, babies born after their due date might be larger.
  • Maternal health during pregnancy: A healthy diet and lifestyle choices during pregnancy can contribute to a baby’s healthy weight gain. Conversely, smoking, drug use, or poor nutrition can lead to a lower birth weight.

Postnatal factors:

  • Sex: Baby boys typically weigh slightly more than girls at birth and tend to gain weight a bit faster during infancy.
  • Diet: Breastfed babies generally gain weight at a slower pace than formula-fed babies in the first year.
  • Genetics: The size of the parents plays a role in a child’s weight.
  • Overall health: Underlying health issues, digestive problems, or chronic illnesses can affect a child’s weight gain.
  • Activity level: While not as prominent at this age, physical activity can contribute to healthy muscle development and weight gain.

Healthy Weight Range Guidelines for 1-Year-Olds

As an adventurous path in parenthood, when your child reaches the 1-year milestone, you may wonder about the “ideal” weight and height for them.

Let’s see some average numbers. At 1 year, toddler boys commonly weigh around 26.8 pounds and stand at about 34.6 inches tall. Remember, these are just averages and kids can healthily fall within a range above or below these markers.

It’s more than just a numbers game though! At this stage, your little one’s growth isn’t only about gaining weight or height. It’s also about their overall development, exploring new stuff, learning to walk, run, and really start interacting with the world.

Age (Months) Weight (lb/kg) Height (in/cm)
12 21.3/9.6 29.8/75.7
13 21.8/9.9 30.3/76.9
14 22.3/10.1 30.7/77.9
15 22.7/10.3 31.2/79.2
16 23.2/10.5 31.6/80.2
24 26.8/12.1 34.6/87.8

But also remember, every child is unique in their growth pattern. As we move towards the teenage years, factors like puberty will play a significant role in patterns of weight gain and growth spurts. Just continue to offer a balanced diet, engage them in active play, and provide plenty of love! You’re doing great.

How Breastfeeding Impacts Baby Weight?

Breastfeeding and formula feeding can influence a baby’s weight gain in different ways. Here’s a breakdown of how breastfeeding impacts baby weight:

Slower Weight Gain:

Breastfed babies typically gain weight at a slower pace than formula-fed babies, especially in the first few months. This doesn’t necessarily indicate a problem. Breast milk is designed to meet a baby’s specific needs, and they tend to eat only what they need.

Different Growth Patterns:

Growth charts acknowledge this difference. They have separate curves for breastfed and formula-fed babies to account for the expected variations in weight gain patterns.

Potential Benefits:

Studies suggest that breastfed babies may be less likely to become overweight or obese later in life. This might be due to the hormonal and regulatory factors in breast milk that influence metabolism and appetite.

Frequently Asked Questions

How does breastfeeding support a baby during growth spurts?

During growth spurts, a baby’s feeding patterns change. They intuitively adjust their intake, and breastfeeding allows this adaptability. The nutrients and volume of breast milk change in response to the baby’s needs, effectively supporting their growth spurts.

Does the nutritional content of breast milk change as the baby grows?

Absolutely. Breast milk is a dynamic source of nutrition. As the baby grows, the breast milk evolves, adjusting its nutritional density and volume to meet the changing needs of the growing child.

Is the baby’s intake capacity related to their growth rate?

Yes, babies naturally regulate their intake according to their growth needs. During growth spurts, for instance, they tend to eat more due to increased nutritional requirements. Breastfeeding supports this intuitive adjustment, helping maintain a healthy growth rate.