How Long do Babies Wear Newborn Clothes


Those little feet won’t be little forever.

As a mother, nothing is more beautiful than seeing your toddler grow. Speaking of personal experience, I am here to say it aloud; babies grow rapidly.

But this is a disguise in blessing. 

We love to shop for baby stuff. And first-time mothers rush to buy newborn clothes. This is where the “problem” begins.

So, how long do babies wear newborn clothes? Well, this can be tricky to explain. But here’s your quick answer;

An infant can wear newborn clothes for a maximum of 8 weeks. This can vary depending on the size of the clothes, height, and weight of your baby.


But what’s the size of the baby onesies of different brands? And how to determine how long it will fit.

Well, worry not! This is where we came in. In this article, we will guide you in detail about newborn clothes. So, hold the plunge and keep on reading.

Newborn Clothes Size

Usually, most newborn clothing is 21 inches long. On average, newborn babies have a height between 18 to 19 inches. This leaves the margin for 3 – 4 inches.

Have a quick look at the table below for infant clothing sizes by famous brands.

Clothing BrandWeight LimitHeight LimitHow Long Will It Fit?
OshKoshUp to 7 lbsUp to 18 inches3 – 5 weeks
Amazon Essentials Up to 8 lbsUp to 20 inches4 – 6 weeks
GerberUp to 8 lbsUp to 21 inches4 – 7 weeks
Old NavyUp to 7 lbsUp to 18 inches3 – 5 weeks
Cat & JackUp to 8 lbsUp to 20 inches4 – 6 weeks
CarterUp to 9 lbsUp to 18 inches3 – 5 weeks
GAP / Old NavyUp to 7 lbsUp to 18 inches3 – 5 weeks
Little MeUp to 8 lbsUp to 21 inches5 – 7 weeks
DisneyUp to 7 lbsUp to 19 inches4 – 6 weeks

How Long Do Newborn Clothes Fit? 

It is safe to say that newborn clothing will only fit for a maximum of 7 weeks. But some babies do grow faster and gain weight quickly. In such a case, the limit will be 6 weeks.


Some brands do offer 000 and 00 sizes. The 000 size is suitable to use for 0 to 10 weeks, while 00 can be used for up to 5 months.

What Size Will Fit My Newborn?

Unfortunately, there is no quick answer to that. It depends on 4 major factors. 

1. Your Baby’s Weight

At the time of birth, a baby weighs between 6 to 8 pounds. And within two weeks, they can gain 1 – 2 pounds.

In normal conditions, the newborn clothes can be used for 5 weeks. For big babies, it is best to opt for 0-3 size.

2. Clothing Size

Happiness comes in all shapes and sizes. But most of the baby clothes are only 21 inches in length. 

At the time of birth, a baby has a length of 19 inches. Infants can gain 2 inches within the first two months. 

3. Baby’s Leg Size

This is something that every mother relates to. Some brand’s trousers will be too long for your little one, and some will barely fit.

It limits your options, and then you have to stick to a brand. The best thing you can do is measure the trouser or romper every time before buying.

4. Fitting Type

Some babies like properly fitted clothes, while some stay comfortable in loose shirts. But at this age, babies can’t decide. So, parents have to make this decision.

Speaking of personal experience, infants stay comfortable in loose clothes. So, it is best but a big size.

Newborn Size VS 0-3 | Which One Should You Buy?

Technically, newborn clothes are designed and stitched for babies up to 19 inches (at the time of birth) and with a weight of 8 lbs.


And 90% of babies come to this world in the exact shape and size

The problem begins in the 7th week (second month) when newborns start gaining weight and height.

At this time, the “newborn or 000 sizes” won’t be a perfect fit. And truth to tell, clothes are quite expensive. 

On the contrary, 0-3 size is perfect for a toddler with 24 inches of height and 14 lbs weight.

Ideally, 0-3 size will fit for a minimum of 3 months, saving your hard-earned money and essential baby closet storage

So, it is best to buy big!

Newborn Clothes Size FAQs

How long do newborn clothes last?

Newborn clothes will be a proper fit for a maximum of 6 to 7 months. After that, your baby will start gaining weight and height rapidly. 

How long is a baby a newborn?

The term newborn usually refers to birth to two months. After that babies will refer as infants.

How long will a 7lb baby be in newborn clothes?

A 7lb infant can be in newborn clothes for up to 6 weeks. If the height of your baby is a maximum between 17 – 18 inches, then you can use them for 8 weeks.

Are newborn clothes the same as 0-3 months?

No, both are different from each other. Newborn clothes are for babies weighing 5 to 8 pounds. While 0-3 size is a fit for infants weighing 9 to 12 pounds.

Wrapping It Up!

Behold, before you rush toward buying loads of baby stuff. This is because the newborn clothes will only fit for a maximum of 8 weeks after birth.

That’s why most people prefer to buy 0-3 size rather than the 000, a.k.a, newborn clothes. But, in general, it depends on the height and weight of your little one.

We hope that this article answers all your concerns. Well, in the meantime, enjoy these lovely days because they will be gone quickly!

Sylvie White
Sylvie was born and raised in France. In 2010, she came to Newyork for studies and fell into the spell of central park. In 2018, she gave birth to beautiful twin daughters “Lilly and Rosa.” Having a degree in Early Childhood Education helps her a lot during nurturing. An experienced mommy on a mission to guide for the best.