How Do Baby Clothes Sizes Work?

How Do Baby Clothes Sizes Work?

When preparing for the arrival of a newborn, it can be an exciting, as well as, anxious time for parents. If you're new to parenthood, it can be scary even, especially when it comes to knowing baby clothes sizes. If your baby is all grown, you can easily buy clothes depending on their current age. But, things are quite different for infants, who come in all sizes and shapes. To make matters even trickier, baby clothes with the same size on the label may not actually be the same length or width! In this guide, we explain all you need to know about baby clothes sizes. By the end of this article, you’ll know exactly the right size of baby clothing to buy for your kid.

Baby Clothing Sizes: The Basics

Buying clothes for your yet-to-be-born baby can be fun, and filled with a lot of expectations. But, with such a multitude of choices, where do you even begin? And what if you get the size wrong?

When doing your shopping, consider the height and weight of the baby. Newborn clothing is marked as NB (for a newborn), infant clothing is marked by month (e.g. 0-3M), and toddler clothing is marked by age (e.g. 2T, meaning two-year-olds). But, ask any seasoned parent, and they will tell you that the clothing they bought didn’t match his /her baby’s age. Either the newborn clothing was too big, or it didn’t fit at all.

That’s why sometimes it's advisable to look at the brand's chart size for guidance. You should also purchase baby clothing size that corresponds to the baby’s height and weight rather than age.

Another tip is to buy 0-3month clothes for an unborn baby. You might feel like they are big but within no time they will have outgrown newborn sizes.


Babies Grow Very Quickly

Sometimes you can get an uncontrollable urge to buy baby clothes in bulk. But before you do, keep in mind that babies grow at a quick pace. Soon, all the clothing you bought will be too small to fit. Your friends and family may also shower you with presents of baby clothing that your baby won't be using for long. With that in mind, you might want to go light on your shopping, at least until you meet your cute little adorable son or daughter.

Some parents might argue that buying only the clothing you need will mean having to wash them frequently. The thing is, most baby clothes are designed to withstand countless washes. And one more thing, don’t cut off the tags or dispose of the packaging of the newborn clothing yet until they are ready to wear them. Your baby may come into this world bigger than you thought, and you may have to return the clothing because it doesn’t fit.

Keep the Seasons in Mind

Given how fast kids grow, consider the weather when buying baby clothing. There’s no use purchasing a sundress in winter when it probably won't fit her by the time it gets to summer.

Think Practical

Donning your baby in fluffy ears and bunny tail may seem adorable, but attachments and hoods can be hazardous to newborns. Plus, they may prevent them from enjoying the deep sleep that they need.

Additionally, opt for easy-off outfits that are easy to remove. The last thing you want is having to deal with clothing that poses a challenge to remove.


Stocking Your Baby Closet

When preparing for the baby, knowing how much of every size you need can be a monumental task. Having a rough idea of how to stock the closet with every size will help ensure that you’re not over-or understocked. It will also help you guide your friends and family so they don’t shower you with too much of one size.

Know for a fact that there's no telling how quickly your baby will grow or how messy he/she will be, hence requiring a frequent change of clothes. So, rather than plan for exact sizes, go with estimates.

If you're still feeling a little confused, here’s a chart showing how baby clothes sizes work. Remember, this is just a guide. When in doubt, opt for a larger size since the baby will soon grow into it.





up to 6 lbs / up to 2.7 kg

up to 17 in. /up to 43 cm


6-9 lbs / 2.7-4.1 kg

up to 21.5 in. / up to 55 cm

0 to 3 months

9-12.5 lbs / 4.1 - 5.7 kg

21.5 - 24 in. / 55 - 61 cm

3 to 6 months

12.5 - 17 lbs / 5.7 - 7.7 kg

24 - 26.5 in. / 61 - 67 cm

6 to 9 months

17 - 21 lbs / 7.7 - 9.5 kg

up to 28.5 in. / up to 72 cm

0 to 9 months

up to 21 lbs / up to 9.5 kg

up to 28.5 in. / up to 72 cm

12 months

21 to 25 lbs / 9.5 -11.3 kg

28.5 to 30.5 in. / 72 to 78 cm

18 months

25- 28 lbs / 11.3 - 12.7 kg

30.5 to 32.5 in. / 78 - 83 cm

24 months

28 - 30 lbs / 12.7 - 13.6 kg

32.5 to 34 in. / 83 - 86 cm


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