Newborn and Baby Clothes Sizes | Baby Clothes Size Chart | Dreft (2024)

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Newborn and Baby Clothes Sizes | Baby Clothes Size Chart | Dreft (1)

New parents are faced with a seemingly unending stream of decisions, purchases, and new routines well before their bundle of joy even arrives. Near the top of parents’ to do checklist for new baby is buying clothes for the new baby. Deciphering baby clothing sizes can be confusing, so in this article we’ll dig into how baby clothes sizes work and provide some baby clothes size charts to help clear things up.

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How do baby clothes sizes work?

Clothes sizes for babies are typically labeled by age. Depending on the brand of clothing, some of the sizes you can expect to see are:

Each child is unique and grows at her own pace, so trying to buy clothes that fit and last more than a single wear can be a challenge. Size differences between brands occur because brands design their baby clothes sizes by weight for each age group. This means some clothes may fit your baby perfectly within their age range while others will be too large or too small.

The most important thing to note with respect to sizes is that they represent an average range, and the size listed will be the upper limit of that range. 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.

Baby clothes sizes charts

When it comes to baby clothes, not all sizes are the same. That’s why it’s always important to check each brand’s size charts to make sure you pick out clothes that fit right the first time. And to make things easy, we’ve put together a list of all the top baby clothes brands with sizing.

OskKosh Sizing¹:

Amazon Essentials Sizing²:

Gerber Sizing³:

Old Navy Sizing⁴:

Cat & Jack Sizing⁵:

*Size specs are approximations based on average baby size pulled from

Carter’s Sizing⁶:

How long do babies fit in newborn clothes?

This will depend on your baby, but typically infant clothing sizes fit for 4-6 weeks after you bring him home from the hospital. It can be confusing to determine the difference between Newborn and 0-3 month clothes, but typically Newborn sizes cover babies in the 5-8 pound range while the 0-3 month sizes fit 8-12 pound children. Each baby is different and grows at their own pace, so don't be alarmed if your baby quickly outgrows Newborn sized clothes. If your little one is in a higher percentile for weight or height, they may even be wearing 0-3 month clothes home from the hospital! Expecting parents should also keep in mind that new babies are messy. Everything from diaper blowouts to spit up to spilled bottles means you’ll be washing a lot of baby clothes once she arrives. Repeated washes will shrink clothes, so it's important to pay attention to your wash and dry cycles to reduce shrinkage and buy extra clothing if needed.

How to buy baby clothes?

  • Try before you buy When possible, shop for baby clothes in person. This will allow you to see and feel the clothes and get an idea for the size of something before you buy. Just because your baby fits into a 3-month romper in one brand doesn't mean she will in another, so shopping in person can prevent unwanted purchases.

  • Size up As a rule of thumb, it's best to buy big. Your baby will grow quicker than you think and you can always roll up sleeves or pants on too-big items and let your baby grow into them over time. Who knows… you may find that an item that is at first too-big fits just right after a run through the wash.

  • Wash Before WearWhether you bought new baby clothes or got them secondhand, it’s always important to make sure anything that touches your little one’s skin is properly washed to remove dirt, stains or anything you might’ve missed. Dreft baby detergent is perfect for this, because it has the power to remove stains, while being gentle on delicate skin.

Frequently Asked Questions About Baby Clothes

  • Pay careful attention to the material and stitching used, not just the size. Clothes made from 100% cotton will be more prone to shrink in the wash, so don’t be afraid to buy big. Inspect stitch and fabric quality as well. Low-quality stitching and fabric are more prone to fall apart in the wash after just a few cycles.

  • 24-month outfits are designed for children still in diapers while 2T is more focused on potty-trained toddlers. While there may be slight differences in actual size, a 24-month onesie with multiple buttons can be tough for parents and children to undo for the potty. 2T clothes tend to feature more zippers and elastic waistbands, so it’s easier for your child to use the bathroom.

  • This will depend on how quickly your baby grows, your laundry schedule, and whether dressing in layers is needed. Wintertime babies will need more items to bundle up in, paying special attention to foot and head coverings. If your family only does laundry once or twice a week, this will also affect how many outfits you need as babies often wear several outfits a day. Below are some general guidelines that can be adjusted based on your own personal needs. In this case, “outfit” means shirt/onesie, pants, and a pair of socks.

    • 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.

    • 6 – 9 month – Plan on one outfit and a sleeper each day

    • 9 – 12 month and beyond – One outfit and pajamas each day

Buying clothes for your baby is exciting and fun, even if it’s a little confusing at first. Now that you know how to read size labels and have explored some of the brands available to your child, keep what you’ve learned in mind as you begin to prepare. Shop in person and follow your checklist to prevent overbuying and unwanted purchases from making it into your baby’s closet and dresser drawers!

Newborn and Baby Clothes Sizes | Baby Clothes Size Chart | Dreft (2024)


What size baby fits in newborn clothes? ›

This will depend on your baby, but newborn clothing typically fits for 4-6 weeks after you bring baby home from the hospital. 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.

How many clothes are enough for newborn? ›

Keeping those newborn sizes in mind, it's best to have 10-15 baby onesies ready to go. Most newborns live in onesies their first few months, as it's much easier to change them. Plus, you can layer organic cotton onesies with stylish tops and bottoms for a wonderfully warm baby outfit.

What's the difference between first size and newborn? ›

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 sizes should you buy for newborn? ›

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.

What is the rule for newborn clothes? ›

Clothing Tips

It's generally best to dress your baby in an undershirt and diapers, covered by pajamas or a dressing gown, and then wrap him or her in a receiving blanket. For an extra layer, a wearable blanket sleeper or sleep sack is a safe alternative.

Will a 9lb baby fit in newborn clothes? ›

Size newborn is for babies 5-8 lbs, and up to 21.5", but even most babies up to 9 lbs or so will fit better in size newborn for at least a few days. That's because your newborn's length will also affect their clothing size. The average length of a newborn baby is 19.5" with a normal range of 18-22".

How do you know if you have enough baby clothes? ›

Here's a general guideline:
  • Bodysuits or onesies: 7-10.
  • Sleepers or footed pajamas: 7-10.
  • Socks or booties: 6-7 pairs.
  • Hats: 2-3.
  • Swaddle blankets: 2-4.
  • Burp cloths: 6-10.
  • Mittens: 2-4 pairs (to prevent scratching)
  • Special occasion outfits: 1 or 2 (if you have events or photoshoots)
Oct 11, 2023

Does it matter if newborn clothes are too big? ›

If you're buying for your unborn baby, in general it's best to buy 0-3 month clothes, as newborn size can be outgrown very quickly. It's important to never dress them in clothes that are much too big though, especially sleepwear. It could be a suffocation risk.

Will size 0-3 months fit a newborn? ›

Whereas 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.

How does baby clothes 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).

How long do newborns wear size 1? ›

4 to 5 boxes of Size 1 (based on a 164 pack size; babies will typically be in this size for 3 months, with 6-9 diaper changes per day) 5 boxes of Size 2 (based on a 148 pack size; babies will typically be in this size for 3 months, with with 6-9 diaper changes per day)

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.

Will an 8 lb baby fit in newborn clothes? ›

Baby clothes sizes by weight

NB (Newborn): 5 to 8 pounds. 3 months: 8 to 12 pounds. 6 months: 12 to 16 pounds. 9 months: 16 to 20 pounds.

Is 0-3 months the same as 3 months? ›

“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.”

How many onesies do I need for 0-3 months? ›

0-3 Months Clothing Size

Stick to the two outfits a day rule, making sure you have at least 14 different options to experiment with. Onesies and rompers are still excellent choices here. You'll also need to think about the seasons. If it's warm, you might want to stick with layers like onesies and short-sleeved shirts.

How long do babies stay in newborn size diapers? ›

How long are babies in newborn diapers? Most babies stop using newborn diapers once they're over nine or 10 pounds. So if baby arrives on the scene weighing less than that—and they weren't born prematurely—they'll probably grow out of newborn diapers by week three (give or take).

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