A Quick Guide to Baby Clothes Sizing (2024)

Did you know that there are 3.6 million babies born every year in the United States alone? If you are a new parent or purchasing gifts for someone that has just become a parent, figuring out the right size for baby clothes can be confusing. You might even encounter variations between manufacturers, styles, and even fabric choices.

From how to measure your baby for the best fit to understanding the different sizing options around, we've collected a quick guide to baby clothes sizing for you so that you can remove the guesswork and make sure you get the right fit for your infant or toddler's wardrobe.

How to Measure Your Baby for Baby Clothes Sizing

While it can be difficult to get accurate measurements from a wriggling baby, we’ve put together some helpful tips on how to get it right.

First off, make sure you have a good flat surface so that you can spread out a blanket to lay your baby on to begin your measurements. Have a flexible tape measure on hand. You'll also want to record the baby's height and weight, which is most accurately done without a diaper.

Related: A Gift Guide For Personalized Baby Girl Clothes

With your baby's true measurements, you'll be able to shop with confidence and take advantage of any baby clothes sales. These are the areas you will need to measure:

  • Hip Circumference: For an accurate hip measurement, the baby should be on their back, toes up in the air with straight ankles and feet touching. Make sure you measure the baby’s hip circumference at the widest part of the hip.
  • Chest Circumference: Put the tape measure underneath the baby’s arms at the widest part of the chest while the infant is on their back to accurately check chest circumference.
  • Arm Length: Hold the baby’s hand and measure from the wrist to the shoulder of the straight arm.
  • Inseam: Accurate inseam measurements are taken from the crotch to the bottom of the foot of one leg.

Taking these measurements means that you'll be able to find clothing to fit your child without any guesswork.

How to Choose the Right Sizing for Baby Clothes

Clothing sizes for newborns or infants is determined using a variety of factors. It may take into account the age or weight, or even length of the child. So to make sure you are buying clothing that will fit your child, there are certain things to bear in mind:

Fabric

The type of fabric for your baby's clothes matters. Cotton will be comfortable, but items from some brands—particularly non-luxury ones—may shrink with repeated washing. Babies go through a lot of clothes from day to day, so you will want clothes that are durable and can withstand the laundry process. If you want cotton, consider sizing up when buying from non-luxury brands—or make sure you purchase from a company that creates high-quality cotton baby clothes designed to withstand shrinkage while remaining soft and beautiful, wash after wash.

Trial and Error

If you are buying a lot of different baby clothes brands, you may have to test them all out and see what fits your baby. Sizes vary from company to company. The best way is to have your baby's current measurements on hand and look up each brand's sizing chart to figure out the best match every time you shop.

Research the Clothing

Some clothing companies tend to run small/large, shrink, not hold up, or worse. By doing research on the company, reading reviews of the clothes, and learning about their fabric and cut, you can make the best decision for your child's long-term clothing needs. Remember, reviews that simply say, "It's cute!" aren't helpful when you're trying to find sizing and durability.

Learn about Labels

You'll want to remember that the size on the tag is an estimate and often the age at which a child will have outgrown the item. Your new footed pajamas that say 6 months may not fit your 6-month-old baby.

The label gives you an estimate, but your baby may be growing faster or slower than that. By 6 months of age, many children are in 9–12-month clothes. Your baby is growing on his or her own timeline, so adjust the clothes to the baby and don’t worry if the age on the clothes doesn’t match the age of your baby.

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Learning about baby clothes sizing and the correct way to choose them can help you whether you are buying for your own child, or for someone else's as a gift for birthdays or baby showers.

Baby Clothes Sizing

A general guide to baby clothing sizes is as follows:

  • Premature: 5 lbs and under
  • Newborn: 5-8 pounds
  • 3 Months: 8-12 pounds
  • 6 Months: 12-16 pounds
  • 9 months: 16-20 pounds
  • 12 Months: 20-24 pounds
  • 18 Months: 24-28 pounds
  • 24 Months: 28-30 pounds
  • 2T: 29-32 pounds
  • 3T: 32-35 pounds
  • 4T: 35-39 pounds
  • 5T: 39-43 pounds

Remember that this is a template guide, and actual sizing will vary by company.

Are Your Baby Clothes Too Big? Here's What to Do

Sometimes when you are between sizes baby clothes may be too big for your infant. While this is better than them being too small and constrictive, there are things you can do to make clothes that are too big more comfortable.

  • Hem the clothes: If you are adept with a sewing machine or needle and thread you can alter the clothes to be smaller.
  • Roll them: Rolling the pants or sleeves when they are too long can help them fit better and allow them to easily be fixed when the child does grow into the clothes.
  • Sock the pants/pajamas: If there are pajamas or pants that are footed and are too long to properly fit your child making for excess fabric, you can add socks to the feet over the footed area. This will help keep them in place. Make sure the socks aren't too tight and that the baby isn't too warm with this added clothing.
  • Fold the waist: Some pants may allow you to just fold over a waistband. Flipping the waistband will mean that the legs are shorter and may fit your child better.

While babies should transition between baby clothes sizes with little to no problem, it is not uncommon to dress them in clothes that leave a little room to grow. These tips and tricks can help you make clothing adjustments to ensure a better fit while your baby grows into your new size options.

How Many Baby Clothes Do You Need in Each Baby Size?

When creating your baby's clothing collection, there are some essential items to remember, including onesies, rompers, pajamas and booties. Here's a quick list of the essentials to get in every size:

  • 6 shirts
  • 7 footed pajamas
  • 6 onesies
  • 5 one-piece rompers
  • 3 two-piece outfits
  • 6 socks/booties
  • 2 dressy outfits
  • Summer Babies – a swimsuit and a sun hat
  • Winter Babies – a sweater, snowsuit, and a knit hat

This is a great starting point for the essentials, and you can add or subtract as needed for you and your baby's circ*mstances. Another fabulous idea? Grab some of these in a monogrammed or other personalized option for gift-giving or to show off your baby's customized style!

Properly Sized Baby Clothes for Every Occasion

Now that you know how to measure your baby, the factors that may influence clothing sizes, and some of the things to look for in baby clothes essentials, you are going to want to go shopping! At Elegant Baby, we know everything there is to know about luxury baby products and offer the best in fashionable baby clothes. Shop the collection today and find personalized baby gifts and high-end blankets, toys and apparel, to delight even the most discerning recipients.

A Quick Guide to Baby Clothes Sizing (2024)

FAQs

How many outfits do you need in each size for a baby? ›

0 – 3 month – Plan on two outfits and a sleeper each day, but don't overbuy in this range as your child will grow quickly. 3 – 6 month – Plan on one to two outfits a day plus a sleeper. You may also need bibs for drooling.

What size does 0-3 months fit? ›

Baby (NB-24M)
SizeWeightHeight
Newborn6-9 lbs (9M)/ 2.7-4.1 kgup to 21.5 in. / up to 55 cm
0-3 months (3M)9-12.5 lbs / 4.1 - 5.7 kg21.5 - 24 in. / 55 - 61 cm
3-6 months (6M)12.5 - 17 lbs / 5.7 - 7.7 kg24 - 26.5 in. / 61 - 67 cm
6-9 months (9M)17 - 21 lbs / 7.7 - 9.5 kgup to 28.5 in. / up to 72 cm
4 more rows

What size does 6 to 12 months fit? ›

In the US, size 70 is similar to a 6–12-month size and should fit babies who are 16 to 20 pounds, or 26 to 28 inches long. However, different brands may have different size charts, so it's always best to check the specific measurements before buying.

Is 2T the same as 24 months? ›

Fit Differences

The 2T size won't have the extra room, appearing slimmer and feeling snugger than size 24 months. 2T pants usually feature straighter lines than 24-month pants or joggers, giving them a distinct “big kid” style.

How is baby size calculated? ›

The simplest way to gauge a baby's size in utero is to measure an expecting mom's fundal height. Fundal height measures the distance from the pubic bone to the top of the uterus in centimeters. Your health care practitioner will also palpate your abdomen to get an idea of your baby's size.

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.

Should you size up in baby clothes? ›

In addition to having a few NB pieces set aside before baby's birth, as a general rule of thumb, it's always smart to size up when you don't know baby's exact size. For instance, when buying clothes for a 3-month-old, opt for the 3-6 month (or larger) size range instead of the 0-3 month range.

What size is 3T in months? ›

A: the T stands for toddler, thus 2T is for a two-year old (24 months) and 3T for a three-year old (36 months). Next sizes up are 4, 5, 6 and 6x.

Will a 9lb baby fit in newborn clothes? ›

While the size marked on the label make it seem like it's based on baby's age, it's really based on size. For example, “preemie” § usually fits babies up to 17 inches long and five pounds. “Newborn” (NB) represents an average baby at birth up to 21.5 inches long and five to eight pounds.

How does infant sizing work? ›

The Basics: Babies Grow at Their Own Pace

In general, baby clothing is sized by age. Newborn clothing is marked as NB (for newborn), infant clothing is marked by month (for example, 0-3M) and toddler clothing is marked by age (for example, 2T for two-year-olds).

What size is Carter's 6 month? ›

Carter's Little Baby Basics Size Chart
6 mo.12.5-17 lbs.24-26.5"
9 mo.17-21 lbs.26.5-28.5"
12 mo.21-25 lbs.28.5-30.5"
18 mo.25-28 lbs.30.5-32.5"
5 more rows

How long will a baby wear newborn diapers? ›

Note:
DIAPER SIZEWEIGHTAGE RANGE
NewbornUp to 10 lbs.first few weeks only
Size 18–14 lbs.birth–4 months
Size 212–18 lbs.3–8 months
Size 316–28 lbs.5–24 months
4 more rows
May 15, 2020

How long do babies stay in newborn clothes? ›

Put simply, there is no straightforward answer to the question, “How long do babies wear newborn clothes?” But, here is a general rule of thumb: If your baby weighs eight pounds or less at birth, you can probably expect them to be in newborn sizes for about three to five weeks.

What size clothes to buy when having a baby? ›

Newborn clothes: sizes

Size 000 is intended to fit babies from 0-3 months, and size 00 is for babies from 3-6 months. Some bigger newborns might be ready to go straight into a size 00. You might have to roll up the sleeves, but it won't be for long.

Is 3,6 and 6 months the same? ›

“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 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.

What size are 3 to 6 month clothes? ›

Babies' Sizes
SizeAgeHeight (cm)
0000New baby56
0000-3 months62
003-6 months68
06-12 months76
4 more rows

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