Baby Clothes Sizes: A Guide to Finding the Right Fit (2024)

One of the challenges of beginner parenting comes in the seemingly mundane topic of baby clothes sizes. Sizes can be confusing for adult wearers, how much more for babies? Don’t fret, we are about to make it simpler for you! From newborn stage to toddlerhood, here’s the ultimate guide to baby size charts.

At a Glance

  • Baby clothes sizes can be determined by the age and weight of the baby. Keep in mind, however, that babies grow and develop at different rates. Different brands also slightly differ in sizes.
  • As a general rule of thumb, buy only growsuits and singlets in size 0000’s. You can buy more type of clothes in size 000’s to size 1’s since they will be used by the infant for longer.
  • If your baby is walking and potty-trained, you have now graduated to toddler sizes (size 2T and up), which are designed to accommodate your child’s added mobility.
  • While the European sizing for babies is based on height, which is measured in centimeters, UK sizes are more similar with US sizes though with small differences.

So many things factor in when it comes to dressing your little one. Aside from the obvious question of what kind of clothing to buy, there’s the issue of sizes. What’s the clothing size for a baby? How different is it from a toddler’s? How do you convert different clothing sizes? The questions are endless. Let’s go through it step-by-step.

  • Baby Shoe Size Charts

Baby clothes size chart: newborn up to 24 months

US SizeAgeWeight
(in lbs.)
Length
(Inches)
PPreemieUp to 5Up to 17
NBNewborn5-8Up to 20
3M0-3 Months8-12.520-23.5
6M3-6 Months13-16.524-25.5
9M6-9 Months17-20.526-27.5
12M9-12 Months21-23.528-30.5
18M12-18 Months24-26.531-32.5
24M18-24 Months27-3033-34.5

Clothes size chart for toddlers

SizeHeightWeight (lbs)
PreemieUp to 17Up to 5
Newborn17-1/2 - 215-1/2 - 7-1/2
0 - 3M20-1/2 - 236-1/2 - 12
3 - 6M23-1/2 - 2612-1/2 - 16
6 - 9M26-1/2 - 27-1/216-1/2 - 19
12 Month28 - 29-1/219-1/2 - 22
18 Month30 - 31-1/222-1/2 - 26
24 Month32 - 33-1/226-1/2 - 30
2T32 - 33-1/226-1/2 - 30
3T34 - 37-1/230-1/2 - 34
4T38 - 41-1/234-1/2 - 38
5T42 - 44-1/238-1/2 - 42

How Do You Measure Baby Clothes Sizes?

To put it simply, sizes can be determined by the age and weight of your baby. Keep in mind though that babies grow and develop at different rates. Aside from this, different brands also offer some slight differences in sizes.

In this stage of your baby’s growth, the general rule of thumb is to not go overboard and buy a whole wardrobe full of size 0000’s you will unlikely use. Buy only some basics such as growsuits and singlets in size 0000’s and focus more on the size 000’s to size 1’s which your infant will use longer.

For toddlers, things are a little different.

Moving up from a size 2 to a size 2T is a little bit confusing. Clothing sizes have now changed from babies to toddlers. You are probably wondering what the difference is between the two. Simply put, if your baby is walking and potty-trained, you have now graduated to a size 2T and up. Because your little one is now more active, clothing style for toddlers has changed to accommodate for your baby’s added mobility.

While the silhouette of size 2s are rounder, serving to accommodate a baby who is still crawling, sizes 2Ts and up are for toddlers who can walk upright. This makes for a much taller and leaner silhouette so your toddler can walk and move easily and with more comfort.

For small and big kids as well as teenagers, this article on kids’ clothing sizes might be what you need.

How Do You Convert Clothing Sizes for Babies?

Now that you have a basic idea of baby measurements and how to determine size correctly, we will delve into another slightly confusing topic – how to convert sizes to other international size types. European and UK sizes are measured differently. While the European sizing for babies is based on height, which is measured in centimeters, UK sizes are a little closer to US sizes albeit some small differences.

Baby Clothes Sizes: A Guide to Finding the Right Fit (1)

9 Useful Tips to Find the Right Baby Clothes Size

Determining your baby’s clothing size is only one of the few key considerations when it comes to clothing your baby. Here are some additional tips to help you make smarter and more efficient choices:

  • For infants, go for the more practical choices. This means buying quality vs. quantity. You won’t need many baby clothes at this point as your baby grows quickly during this stage. Additionally, newborns don’t really get their clothes dirty, so they will wear and tear longer. Also, consider buying more gender-neutral clothes especially if you’re buying before your baby is born.
  • Don’t get too overexcited and buy too many clothes ahead of time. This is a mistake so many newbie parents make too often. Some babies are born big and could only use newborn sizes for a short time. Growth spurts are also very common at this stage. So, it’s important not to buy too much too soon.
  • Always consider your baby’s comfort when choosing clothes. Babies don’t like clothes that have to be pulled over their heads so avoid separates. Onesies are your best friend.
  • Also consider your comfort as a parent, avoid complicated clothes that will be hard for you to put on your baby.
  • Buy one size ahead of your baby’s age so they can grow in them. This will also help you spend less on clothing.
  • Buy clothing with simpler fastenings. Pants or leggings with elastic waistbands are ideal and you should avoid anything with buttons or anything that your baby can loosen up. They are very curious during this age and accidents can happen.
  • Anything in cotton will go a long way to making your baby feel more comfortable in clothing and can also avoid irritation. Materials that are stretchable can also fit your baby longer as they grow.
  • For toddlers, pick more durable clothing. They tend to move more at this age and are prone to damaging their clothes more often.

Following these simple steps and guidelines will not only save you a lot of money along the way but also a lot of time. Dressing your baby can be a great joy you can experience without making any mistakes or having any hassle. Hopefully, this guide has helped you avoid both.

  • 1 At a Glance
  • 2 Baby clothes size chart: newborn up to 24 months
  • 3 Clothes size chart for toddlers
  • 4 How Do You Measure Baby Clothes Sizes?
  • 5 How Do You Convert Clothing Sizes for Babies?
  • 6 9 Useful Tips to Find the Right Baby Clothes Size
Baby Clothes Sizes: A Guide to Finding the Right Fit (2024)

FAQs

Baby Clothes Sizes: A Guide to Finding the Right Fit? ›

So, if you have a 3-month-old, they will likely be ready to graduate from 0-3 month sizes into 3-6 month sizes if they haven't already. When in doubt, it's best to size up. Babies grow fast and pants and sleeves can be rolled up if an item is too big for your little one.

Is size 3 months the same as 0-3? ›

So, if you have a 3-month-old, they will likely be ready to graduate from 0-3 month sizes into 3-6 month sizes if they haven't already. When in doubt, it's best to size up. Babies grow fast and pants and sleeves can be rolled up if an item is too big for your little one.

How do I know what size my baby wears? ›

Newborn clothes are typically designed to fit babies 6-9 pounds and up to 21.5 inches long. Infant clothing is typically sized using a three-month range: 0-3 months, 3-6 months, etc. Once baby turns one year old, sizes start to use a six month range: 12-18 months and 18-24 months.

When should I move up a size in baby clothes? ›

For the most part, baby clothes sizes fall into roughly three groups; Infants, Babies, and Toddlers. These groups are determined by the baby's age. A baby is considered an infant when they are between 0-6 months, bigger babies are considered between 6 to 12 month and Toddlers are 12 months and up.

What size do babies wear the longest? ›

The longest a baby usually wears newborn is about 1-2 weeks after their due date (even if born early- by the due date they are usually in newborn size). Therefore, for a new baby gift, I would go with a 3M (0-3M) or 6M (3-6M) size to get a little longer wear.

Can newborns wear 0-3 month clothes? ›

Newborn baby clothes sizes

By contrast, size 0-3 months should fit your baby up to 12 pounds, and you can always roll up sleeves and pant legs for a few weeks while baby grows into the larger size. If your baby is predicted to be petite, or you have a preemie, Newborn or Preemie sizes make a little more sense.

Is 1T the same as 12 months? ›

The difference between 1T and 12 months is the way it's made. For example if the 12 month old is not walking yet it's best to get 12 months it's easier to slide a shirt off the shoulder and down where as 1T is not made like that. Thanks is the only difference.

Is 6 months bigger than 3-6 months? ›

Here's a concrete example: Baby Gap's 3-6-month size range fits babies 12-17 pounds and 23-27 inches, while Carter's 3-month clothing fits babies 9-12.5 pounds and 21.5-24 inches and their 6-month clothing fits babies 12.5-17 pounds and 24-27 inches. The difference between 9 and 12 pounds is a lot in babies.

Do babies get their size from mom or dad? ›

Our study suggests that the two parental genomes may be acting at different times during the pregnancy in order to control the baby's size. Whilst greater fetal growth appears to be promoted by the father's genes early on, it must still require careful regulation by the mother to ensure a successful birth.

How to tell when baby clothes are too small? ›

You can see a line in the skin or circulation is cut off slightly when sleeves or pant legs are rolled up. Shirts roll up over their tummy more often. Leg snaps keep popping open means that the fabric is pulling too tight across your baby and can't stretch anymore. Your baby is upset when you put these clothes on.

How do I estimate my baby's size? ›

The two most commonly used methods to estimate fetal weight are ultrasound and clinical examination. Currently, ultrasound is preferred because of its ease of use, objectivity and precision.

What is the rule of clothes for babies? ›

A good rule of thumb is to give your baby 1 extra layer of clothing than what you're wearing. For example, if you're in a t-shirt and jumper, dress them in a vest, sleepsuit and cardigan or jumper. If you feel chilly, your baby probably does too.

What is the most reliable way to choose a baby's clothing size? ›

But here's a general rule: to decide what size clothes to buy for your baby, double your baby's age. For example, if you're buying for a 3-month old, buy a 6-month-old size; if you're shopping for a 6 month-old, buy a 12-month-old size, and so on.

When should I move my baby up a size? ›

If you can't comfortably fit two fingers under the waistband of the fastened diaper, it's time for a bigger size. You may need to go up a size if you notice red marks on your baby's tummy or thighs when you remove the diaper. If the diaper isn't fully covering your baby's bottom, choose a bigger size.

How can I guess my baby's size? ›

Using ultrasound, your practitioner can take various measurements (head circumference and diameter, abdomen circumference, femur length) and use them to estimate your baby's size. They may also use a Doppler ultrasound to look at the blood flow to your placenta.

Is 6 months the same as 3 and 6? ›

“My personal rule is considering that the tag means 'up to. ' So if a label says '3 months,' I think of it being about it being able to fit somewhere between 0-3 months, or if it says '6 months,' it can fit somewhere between 3-6 months.”

Is 24 months the same as 2T? ›

Fit Differences

Size 24 months includes features specially designed for babies. For example, baby bottoms and pants in a 24-month size feature a curved design to fit diapers. The 2T size won't have the extra room, appearing slimmer and feeling snugger than size 24 months.

Is first size the same as up to 1 month? ›

When it comes to clothing sizes, tiny baby is a size that is smaller than first size. Tiny Baby is usually meant for newborns that are born early or small, typically 4lb-7lb but it varies by brand. First Size is usually for a full-term baby, which will average 7.5-8.5lb.

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