Newborn vs. 0–3 Month Clothes: What’s the Difference?

If you are shopping for baby clothes or building your registry, you might be wondering whether newborn and 0–3 month clothes are actually different. They are, and after dressing two babies who started at very different sizes, I would not recommend skipping newborn clothes entirely.

My first baby was 7 pounds 9 ounces at birth and wore newborn clothes for the first few weeks. My second baby was premature and started in preemie clothes, stayed in preemie sizing for about a month after coming home from the NICU, then wore newborn clothes for a couple of months before moving into 0–3 months.

The biggest thing I learned is that the age on the tag is really just a guideline. Babies grow at different rates, brands fit differently, and even the fabric can determine how long something fits.

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What Is the Difference Between Newborn and 0–3 Month Clothes?

Newborn clothes are smaller than 0–3 month clothes. They are designed for those first few weeks or months when your baby is still tiny, while 0–3 month clothes give them more room to grow.

The exact fit varies significantly by brand, though. I have clothes from different brands and even different countries where the sizing is completely different. Some newborn pieces can last surprisingly long, while another brand's 0–3 month size might fit much sooner than expected.

Fabric makes a difference too. Some cotton clothes shrink after going through the dryer repeatedly, while stretchier fabrics can fit for much longer. This is one reason I pay much more attention to how something actually fits my baby than what the tag says.

Should You Skip Newborn Clothes and Buy 0–3 Months Instead?

I would not skip newborn clothes. I heard this advice a lot before having kids because babies supposedly grow out of newborn clothes so quickly, but both of my babies actually used them.

My full term baby was 7 pounds 9 ounces and still needed newborn clothes for several weeks. Putting a brand new baby straight into 0–3 month clothes can mean everything is much bigger and baggier than necessary.

That does not mean you need an entire closet full of newborn clothes. I would buy a small collection of practical newborn pieces and have some 0–3 month clothes ready for when your baby grows into them.

How Many Newborn Clothes Do You Actually Need?

I think about seven newborn sleepers or zip footies is plenty to start. You can always order more once your baby arrives if you realize you are going through clothes faster than expected.

I would also have several 0–3 month sleepers ready. Babies grow quickly, so it is nice to have the next size washed and available instead of suddenly realizing one morning that every newborn sleeper has become too tight.

What Newborn Clothes Will You Actually Use?

Zip footies were by far some of the most useful clothes in our house. Magnetic sleepers were great too, along with simple onesies that were easy to put on, take off, wash, and wear again.

I barely used gowns, pants, or little matching outfits during the newborn stage. Newborns are mostly sleeping, eating, and spitting up, so I found that cute outfits often felt unnecessary. I wanted clothes that could go straight into the washing machine multiple times a week and then immediately go back into the rotation.

Stretchy sleepers can also be worth spending a little more on because they can fit for longer. I particularly like Little Sleepies for this reason. They stretch so much that the cost per wear can be really good compared with clothes that are outgrown after only a few wears.

How Long Do Babies Wear Newborn Clothes?

There is no universal timeline. My full term baby wore newborn clothes for a few weeks, while my premature baby wore preemie clothes first and then stayed in newborn sizing for a couple of months.

Your baby's birth weight, growth rate, length, and body shape can all affect how long newborn clothes fit. A smaller baby may get months of use out of newborn clothes, while a larger baby may move into 0–3 months much sooner.

That is another reason I would not stock up too heavily on any one size before your baby arrives. Have enough to get started, but wait until you meet your baby before buying a huge wardrobe.

Preemie vs. Newborn vs. 0–3 Month Clothes

If you are having a premature or particularly small baby, there is another size before newborn that you may need. My second baby spent about two and a half weeks in the NICU and wore preemie clothes during that time. She continued wearing preemie clothes for roughly another month after coming home before transitioning into newborn sizing.

From there, she wore newborn clothes for quite a while before moving into 0–3 months. She has always been on the smaller side, which is a good reminder that the age ranges printed on baby clothes do not necessarily correspond to your baby's actual age.

When Should You Move From Newborn to 0–3 Month Clothes?

I never followed a particular weight or age to decide when it was time to size up. I simply noticed when the clothes started getting too tight.

If a sleeper is getting difficult to zip, there is not enough room in the feet, or the fabric looks tight across your baby's body, it is probably time to try the next size. Do not worry if that happens earlier or later than the age listed on the tag.

Should You Register for Newborn or 0–3 Month Clothes?

I would register for both, but I would not go overboard with either size. Having around seven practical newborn sleepers and a small collection of 0–3 month sleepers gives you enough to get started without ending up with dozens of unworn outfits.

I would prioritize zip sleepers, magnetic sleepers, and basic onesies over elaborate outfits. You will have plenty of time for cute outfits later. During those first few weeks, easy diaper changes and easy laundry matter much more.

What If Your Baby Never Fits Into Newborn Clothes?

It can happen, especially with a larger baby, which is why I would not buy an enormous newborn wardrobe. But I also would not plan around the assumption that your baby will skip newborn sizing.

You can keep tags on some items until you know what fits, and you can always buy additional clothes once your baby arrives. With fast shipping and online ordering, there is very little reason to have every possible size completely stocked before birth.

Newborn vs. 0–3 Month Clothes: My Bottom Line

Do not skip newborn clothes. You probably need fewer clothes than you think, but having a small collection of properly fitting newborn sleepers can make those first few weeks much easier.

Start with around seven newborn sleepers or zip footies and have several 0–3 month options waiting for the next stage. Pay more attention to how the clothes fit your baby than the age printed on the tag because sizing, fabrics, and babies themselves vary so much.

FAQs

Are newborn clothes the same as 0–3 months?

No. Newborn clothes are generally smaller than 0–3 month clothes. Exact sizing varies by brand, so the difference between the two sizes may be more noticeable with some brands than others.

Do I need newborn clothes or just 0–3 months?

I recommend having some newborn clothes rather than skipping the size completely. My 7 pound 9 ounce full term baby wore newborn clothes for several weeks, and my smaller premature baby wore them for even longer.

How many newborn outfits should I buy?

I would start with around seven practical newborn sleepers or zip footies rather than buying lots of separate outfits. You can always buy more after your baby arrives if you find that you need them.

How long will a baby wear newborn clothes?

Some babies wear newborn clothes for only a couple of weeks, while smaller babies may wear them for a few months. Birth size, growth rate, brand sizing, and fabric can all affect how long newborn clothes fit.

How do I know when to switch to 0–3 month clothes?

Instead of relying only on your baby's age or weight, look at how the clothes fit. If sleepers are becoming tight, difficult to zip, or too short, try moving up to 0–3 months.

Are newborn clothes worth buying?

Yes, but you do not need a huge newborn wardrobe. A small rotation of easy to wash sleepers and onesies gives you enough clothing for the newborn stage without buying too much of a size your baby may outgrow quickly.