When Do Babies Stop Wearing Onesies? Find Out

As a mother, you know all too well how fast time passes with babies. Before you can even blink, they are climbing out of their cribs and the once tiny onesies you packed into your diaper bag have become much too small.

As kids grow up so rapidly, it can be hard to keep track of when certain milestones should be happening – especially concerning clothing sizes.

So when do babies stop wearing onesies?

Onesies can be worn by babies for as long as they are comfortable and it suits your preferences. While it is common for babies to stop wearing them between the ages of 12-18 months, there are no hard and fast rules.

When Do Babies Stop Wearing Onesies

What Are Onesies?

A onesie isn’t your average one-piece item of clothing. Onesies are often mistaken for t-shirts because they resemble them. The Onesie has snap closures at the crotch to make it easier to put on baby clothes.

Sleeveless and long-sleeved safety onesies are also available, sometimes with fold-over cuffs. It’s a good idea to keep your baby’s hands uncovered most of the time to prevent overheating and allow plenty of opportunities for exploration and learning.

Side snap bodysuits are another variation of these traditional onesies. Thanks to fastenings on the side, you may open these out rather than having to unbutton them like a kimono or button-up shirt.

The term “onesie” is also used to describe other one-piece items, such as baby sleepsuits. Sleepsuits cover the entire body and usually have zip or stud fastenings. If your baby stops wearing sleep suits the same reasons why your baby might stop wearing a sleepsuit also applies to these garments.

Why Do Babies Wear Onesies?


Onesies are an excellent choice for baby clothes. They snap securely underneath the child’s stomach and chest, providing a warm and cozy layer of clothing. Smooth and gentle on the skin, onesies are also very versatile. Bodysuits with long sleeves or full-length onesies are ideal for cold weather, while you can wear classic onesies under regular pajamas or alone.


Onesies are readily accessible and inexpensive, often available in multipack deals. You may get baby onesies printed with charming motifs and sayings or plain in various colors. Side snap onesies have a large opening that allows for skin-to-skin contact.


Press-stud fastenings make it easy to get to your child’s diaper for a quick change or if you’re practicing elimination communication and don’t want any misses. A onesie keeps the diaper securely in place but beware of making it too tight. An ill-fitting onesie can be uncomfortable for your little one and cause compression leaks–especially if you use cloth diapers.


Many parents are concerned that their baby’s clothes irritate the umbilical cord stump. This is when they ask the same question, ‘when do babies stop wearing onesies?’ If this is a concern of yours, you can wait until the stump falls off or use side snaps to prevent pulling the Onesie over your child’s stomach. 

Onesies without loose parts and with secure fastenings won’t ride up over your baby’s head and become a potential suffocation risk. 

Is It Okay For 2-Year-Olds To Wear Onesies?

Some brands still produce onesies for two-year-olds, so it’s not strange to see a child wearing one.

Some infants don’t like to use blankets, so their parents put a onesie on them for extra warmth. Just because your child has outgrown wearing onesies by the time they’re 2 doesn’t mean you have to make the switch immediately.

However, you will likely find it difficult to discover enough variation in onesies compared to the vast amount of choices available for babies. And within a few months, those same onesies might not fit your baby since many brands only manufacture them until kids are 2 years old (24 months).

As we previously said, sometimes the reason a child no longer wears onesies is that their parents can’t find them anymore.

When Do Babies Stop Wearing Onesies?

Toilet training

When your baby is ready to start potty training, those handy flaps may become a problem and get wet. Fastenings can also be difficult for your toddler. You may help encourage independence in potty training by using simple tops and pants they can manage independently.


Though onesies are perfect for infants, they might not be the best clothing choice once your baby starts walking. Most babies begin to walk around 8-18 months old, and at that point, it may become easier to dress them in t-shirts and bottoms rather than struggling with fasteners. Once on their feet, footed onesies can become a trip hazard and block your child’s sensation of the floor, which could interfere with their ability to walk correctly.


Finding onesies for newborns beyond the age of two years might be more difficult. If you have a tall child, you may discover that onesies no longer keep your infant comfortable after they reach a certain age. Make sure they have adequate area to stretch out those tiny feet.


It’s common for parents to outgrow the style of once-trendy onesies or find that their baby has started showing preferences in clothing. Remember that if you want your child to learn how to listen, it starts with being an attentive listener.

Creative Uses for Onesies

It can be difficult for parents to release their children’s baby clothes as they grow up. Many wonders what to do with the excess clothing.

If you’re looking for a unique and thoughtful way to show someone you care, why not try one of these ten creative uses for onesies?

Memory Bears 

The onesies you love the most can be turned into soft toys. You don’t have to do any work – send your items off and have a custom-made memory bear.

Hair Accessories 

Whether you want to make a headband or baseball cap, doing it yourself is simple and produces great results.

A Memory Game 

Design fabric squares to create a memory or matching game for your children, and once they outgrow the toy, you can sew the squares together to make a quilt.

Cushions & Pillows

And on mattresses, what about a pillow for your baby’s room or their cherished teddy bear?

Fabric Books 

You could create memory books with easy-to-use fastenings or make a textile alphabet.

Soft Baby Blocks

These are fantastic first toys. Add numbers and basic forms, or attach ribbons to make it more interesting for the youngster who enjoys labels.

Outfits For All

Create outfits for your child’s favorite teddy or doll. Or use a onesie as a basis for dressing up clothes or save patterns and logos you enjoy to put on your bigger kid’s wardrobe.

Wall Art 

Frame your favorite picture of your baby, or mix and match some of their best clothes to create an adorable collage.

Hanging Ornaments 

Turn your old onesies into a baby mobile or festive ornaments to brighten the holidays.

Bags & Pouches 

Make pouches to store toys and trinkets from your treasured memories. Take your souvenirs on the road in a tote bag to help with your shopping, or make some pouches for keeping smaller items.

Frequently Asked Questions

Q1: Why do baby onesies have overlapping shoulders?

Ans: One-piece garments have overlapping shoulders, a clever design feature. These overlaps allow you to pull the Onesie down over your baby’s body rather than its head. If your little one doesn’t want clothes pulled over their head or if your diaper blows out, this is the way to go.

Q2: Is it possible for a kid to sleep in a onesie?

Ans: Wearing a onesie is comfortable and soft, making it ideal for bedtime or naptime. If you live in an area with colder weather, you may consider pairing a sleepsuit or regular pajamas with the Onesie to keep your baby nice and warm. However, if it’s warmer where you live, a onesie by itself will suffice as sleepwear since they also help keep your baby’s diaper in place while providing quick and easy access for changing them.

Q3: Is it necessary for a baby to always wear a onesie?

Ans: It is determined by the parents. You may allow your baby to wear shorts or pants on a hot day to keep them cool since they will be exposed to the sun.

Q4: What clothes should you dress your one-year-old in?

Ans: If you’re shopping for a one-year-old, get a size larger than their actual age since babies develop at an accelerated rate. You may search for clothing in the size 2 category for your one-year-old.

Q5: Is it permissible for babies to wear footie pajamas?

Ans: In the winter, you may give your baby footie pajamas to wear. This will assist in keeping your infant’s body temperature stable. In footie pajamas, you will hide your baby’s arms, legs, and feet. Because they have convenient clips and zippers, they are ideal for his age.


Onesies are a must-have for any baby’s wardrobe. You can also repurpose them into other items once your baby outgrows them.

Onesies are essential for any baby’s wardrobe, but eventually, your baby will outgrow them. When this happens, could you not throw them away? There are many ways to repurpose old onesies, such as making them wall art or ornaments. You can also use them to make bags and pouches.

Sarah here, mother of two here to guide you on your parenting journey. I know motherhood isn't easy, but I'm here to share my wisdom and experience so that you can make the most out of this amazing adventure. Linkedln

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