The most common system for sizing children's clothing is "American sizing" or "US sizing." This system is based on height so that the sizes correspond to your child's height. So if your child falls into a size 4T, they are about 4 feet tall and weigh about 34-1/2 - 38 lbs (or about 17 kg 237 gms).

Sizes in this system are expressed in inches and pounds. For example, a size 2 T-shirt would fit someone who measures 20 inches high and weighs 25 pounds — or approximately 1.5 meters tall at 1 kilogram in weight. If you measure in centimeters instead of inches, each inch equals 2.54 centimeters, so 1 yard equals 0.9 meters, and 1 pound equals 0.454 kilograms (1 kilogram equals 2.2 pounds).

History Behind Sizing

The term "4t" refers to clothing sizes used before the U.S. government changed its sizing system in 1958 (when they started using numbers instead of letters). At that time, three measurements were taken into account: chest, waist, and hip. So, for example, you might have been a size 10 in the waist but a size 14 in the hips. This was called a "three-digit system."

In 1958, the government decided to simplify things by using two measurements instead of three: chest and waist (or bust).

What Is Size 4T?

The size 4T is a size for toddlers and children between the ages of 2 and 4. A size 4T is a larger version of the size 3T and is typically used to describe clothing sizes for children around 40 inches tall and weighing approximately 35 pounds.

Averages of 2 Years Old Children

The average height of a child at age 2 is 36 inches, while the average weight of a 2-year-old is 30 pounds.

Averages of 3 Years Old Children

At age 3, the average height is 39 inches, and the average weight is 36 pounds.

Size 4T clothing can be found in most department stores and specialty shops that sell children's apparel.

Averages Of 4 Years Old Children

At age 4, typically, children between the ages of 4 and 5. Four-year-olds generally weigh between 35 and 40 pounds and are around 40 inches tall. The size they need depends on their height and weight, but they will often be wearing a 4T.

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Percentile For Height And Weight

If your child is four years old, they are likely in the 43rd percentile for height and weight. This means they are taller than 43% of other four-year-olds and weigh more than 43%.

4T clothing is meant for kids around 40 inches tall and weighing approximately 35 pounds. If your child is smaller than this, you may need to purchase 3T clothing instead.

Chart According To Different Brands - Heights, And Weighs

Chart According To Different Brands

What Is Size 4 or XS In Children's Clothing?

What Is Size 4 or XS In Children's Clothing

Size 4 is for children 42-44" in height and 37-41lbs in weight. The average height for girls ages 4-5 is 43 ½ inches tall, while boys are slightly shorter at 41 ½ inches tall. This size fits kids who are between 4 and 7 years old.

They also have a waist measurement of about 23-25 inches, with a chest measurement of about 22-24 inches.

A typical size 4 girl may weigh between 35 and 40 pounds, while a typical size 4 boy will weigh between 35 and 40 pounds. Children this age are beginning to walk, but they still need help from an adult when crossing streets or walking on uneven ground.

They can also run short distances without trouble, but they need the stamina for long sprints. Most of their physical development happens during this period because they grow the most rapidly (about 2 inches per year).

Difference Between 4 And 4T

Size 4

Size 4T


Taller and leaner than size 4t.

The bottom is broad to make room for diapers.


The size 4t toddler diapers are adjustable to accommodate both the use of diapers and the growing needs of toddlers. 

The size 4 toddler does not use diapers and therefore has no need for an adjustable waist.


The size 4t has short sleeves, short pants, and long pants.

The size 4 has long sleeves, long pants, and short pants.

Are Sizes 4 or XS And 4T the Same?

No, Size 4 comes after 4t. It is slightly bigger than size 4t, but only by a little.

A size 4 refers to the height of a child’s waistline in inches. The same rule applies to other sizes as well. So a size 5 refers to the height of a child’s waistline in inches, and so on. However, there is no specific age range associated with these sizes, like adults. You can find children’s clothing in sizes ranging from 2t through 14 or 16, depending on the brand you are buying from.

The difference between the two sizes isn’t much at all, though — just an inch or two of extra length in some cases. So if you have a 4 t-shirt that fits your child well, you can probably get away with buying a size 6 t-shirt without worrying about whether it will fit them properly.

What Does the Number Mean?

The number represents the age range of the child rather than their height or weight. For example, if your child is 2 years old and is wearing 3 T-shirts, they may be too tall and thin to wear comfortably because they need to move into larger sizes that are sized by age rather than height or weight alone. After all, there is no rule stating that once you reach this age, you must stop growing!

Most parents do not buy clothes based solely on their child’s age but consider other factors such as whether or not their clothes fit properly (or too tight) and if they are comfortable in them.

If your child is in between sizes, it will be up to you to decide which size fits their body type and style preference.

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