20 First Birthday Outfits Just as Special as Your Tot

This major milestone is worth dressing up for.
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Updated September 19, 2023
First Birthday Outfits-hero
Image: Nordstrom
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Baby is turning one, which is a one-derful excuse to buy them a celebratory ensemble. A first birthday outfit cues everyone in that it’s their big day. Plus, it’ll make those cake smash photos even sweeter! The best birthday outfits for boys and girls take full advantage of the latest trends—for Instagram, yes, but also for you to reminisce about down the road. Of course, they should also speak to the occasion, like the theme or formality of your child’s first birthday party. For ample first birthday outfit inspiration, keep on scrolling! We’ve made it easy to shop the cutest ideas on the market, from super-sweet Minnie Mouse and Mickey Mouse first birthday outfits to an ultra-trendy mermaid first birthday outfit.

First Birthday Outfits for Boys

These baby boy first birthday outfits pay tribute to the most popular boys’ first birthday party themes. (Plenty of them are also unisex!) Whether you’re looking for something funny or formal, we’ve found cute clothing for your soon-to-be toddler.

Mickey mouse first birthday outfit

Disney Mickey Mouse First Birthday Baby Cosplay Graphic T-Shirt Diaper Cover and Hat Three Piece Outfit Set
Image: Amazon
Buying Options

Mickey Mouse may just be the ultimate emblem of family fun, so this Mickey Mouse first birthday outfit will definitely set the right tone for baby’s party. And how cute is that mouse ear beanie? Cute enough to keep wearing all winter long, that’s for sure!

Material: 60% cotton/40% polyester | Cleaning instructions: Machine wash

Bluey first birthday outfit

Custom Birthday Boy Bluey Toddler Shirt
Image: AlmiraCustomShirt | Etsy
Buying Options
Etsy|From $10

Is there a certain television show about a lovable puppy that everyone in your house can’t get enough of? If so (join the club!), this Bluey first birthday outfit is a must. It’s got your favorite furry friend, and can even be personalized!

Material: Cotton | Cleaning instructions: Machine wash delicate, line dry.

Racecar first birthday outfit

One Racecar Tire First Birthday Personalized Red Romper with Striped Cuff
Image: 2troubleboys | Etsy

Vroom! Vroom! Your little speedster will be cute as can be in this romper (available in red, black and navy) at a race car-themed birthday party! Bonus: Reviewers love the cozy fabric!

Material: Cotton blend | Cleaning instructions: Hand wash, dry flat

Pumpkin first birthday outfit

Baby Boy Halloween Three Piece Outfits Infant Birthday Pumpkin Long Sleeve Bowtie Romper, One Print Pants and Hat Fall Clothes Set
Image: Amazon
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Calling all autumn babies! Dress your little pumpkin up in this autumnal set that comes with a pumpkin-themed onesie with an orange gingham “one,” a bowtie, cozy sweats and the cutest beanie they can wear all season—to the pumpkin patch and beyond!

Material: Cotton blend | Cleaning instructions: Hand wash only

Dinosaur first birthday outfit

Baby Boys Wild One First Birthday Cake Smash Outfit Dinosaur Romper Shorts Suspenders Headband Costume Set
Image: Amazon

Having a dinosaur-themed birthday party? With an adorably fierce bowtie onesie, a suspender dino tail—er, pants—and even a crown, this dinosaur first birthday outfit is bound to cause an up-roar of giggles and smiles.

Material: 85% cotton/15% polyester | Cleaning instructions: Machine wash

Dressy first birthday outfit

Andy & Evan Infant Boys Buttondown Plaid Shirt Set
Image: Target
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Here’s a more versatile (and dressy) option your little one can wear well beyond their birthday. The set comes with a stylish plaid button-down, khaki pants, a bowtie and suspenders—because there’s nothing quite like a baby in suspenders!

Material: Cotton | Cleaning instructions: Machine wash, tumble dry

Lumberjack first birthday outfit

First Birthday Boy Outfit Lumberjack Buffalo Plaid Theme Shirt Cake Smash Onesie One B-Day
Image: Amazon
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We don’t know what it is about a baby in rustic plaid, but lumberjack-inspired first birthday outfits are an ever-popular choice! This super-soft onesie with buffalo plaid trompe l'oeil suspenders and a bright red tie—plus matching leg warmers and a plush ax toy—makes an excellent ensemble for a fall or winter birthday.

Material: Cotton | Cleaning instructions: Hand wash

Monster first birthday outfit

Little Monster Baby Boy Cake Smash Outfit First Birthday Cake Smash Monster
Image: craftingbythecape | Etsy
Buying Options
Etsy|From $8

Planning a monster bash? Pay tribute to your lovable little monster with this sweet, quirky first birthday cake smash gear. Everyone will love the adorable tie and suspenders (they’re one well-dressed monster!) and you can even get the hat or shirt personalized with baby’s name.

Material: N/A | Cleaning instructions: Remove bowtie and hand wash, dry flat

Winnie the pooh birthday outfit

Disney Winnie The Pooh Boys’ 1st Birthday Bodysuit for Newborn and Infant
Image: Amazon
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This Winnie the Pooh first birthday outfit will give parents and children alike all the feels. There’s a reason this character has been beloved for all these years—he’s the perfect silly birthday bear, just like your little guy!

Material: 60% cotton/40% polyester | Cleaning instructions: Machine wash

Seersucker first birthday outfit

Baby's First Birthday Outfit
Image: TipsDesign | Etsy
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For a more classic outfit that may even be passed down to other generations (if it doesn’t get covered in too much cake!), this adorable seersucker romper is a keeper. Its gingham cupcake and personalized name embroidery is oh so sweet, you’ll never want to get rid of it.

Material: Cotton | Cleaning instructions: N/A

First Birthday Outfits for Girls

Looking for dresses, tutus and headbands? We’ve found plenty, plus other adorable details that’ll steal your heart. There’s something for all the cutest first birthday party themes, as well as some formal, wear-again options we love.

Sparkly first birthday outfit

My First Birthday Bodysuit, Tutu and Head Wrap Set
Image: Nordstrom
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Baby’s only one once, so shout it from the rooftops! This sparkly “one” first birthday tutu outfit will surely make them the center of attention. That’s in part because it comes with a fancy matching headwrap!

Material: 100% cotton (bodysuit); 100% polyester (tutu); 100% cotton (head wrap) | Cleaning instructions: Machine wash, line dry.

Ruffled first birthday outfit

Newborn Baby Girl 1st Birthday Outfit Princes Dress with Diaper Cover, Lace Ruffles, and Romper Tutu
Image: Amazon

Can you ever have too many ruffles? Treat your newly minted tot like royalty with pink frills and polka dot sequins, on a dress that will be great for dress-up even after the big day. How cute!

Material: 90% cotton/10% polyester | Cleaning instructions: Hand wash

Boho first birthday outfit

IDOPIP Boho Rainbow Sun 1st Birthday Outfit for Baby Girls Romper Tutu Skirt Headband
Image: Amazon
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A boho first birthday outfit is perfect for any budding flower child. The party will be filled with peace, love and happiness with the birthday girl dressed in this adorable Bohemian onesie, multicolored tutu and sunshine crown.

Material: 95% cotton/5% polyester | Cleaning instructions: Hand wash only

Mermaid first birthday outfit

Baby Girl One Birthday Outfits Ruffle Sleeve Romper and Strawberry Shorts and Headband
Image: Amazon
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Head under the sea for your birthday celebration and dress the guest of honor in this mermaid first birthday outfit. The fishtail bloomers are a great option for those who want to skip the tutu, while the iridescent headband will still add a bit of girly flair. Plus, the ruffles on the sleeves of the onesie are extra adorable!

Material: Cotton | Cleaning instructions: Hand wash only

Strawberry first birthday outfit

GRNSHTS Baby Girl 1st Birthday Outfits Ribbed Tulle Romper
Image: Amazon
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It’ll be a berry good party with your girl in this sweet strawberry first birthday outfit! The pink ribbed onesie will keep her soft and cozy while the strawberry embroidered tulle and headband will add some festive and fruity fun!

Material: Cotton blend | Cleaning instructions: Machine wash

Minnie mouse first birthday outfit

IBTOM CASTLE Cake Smash Half 1st 2nd 3rd Birthday Girl Princess Polka Dots Ruffle Skirt Set
Image: Amazon
Buying Options

Disney lovers, this one’s for you—especially if a birthday trip to Magic Kingdom is in the works! This Minnie Mouse-inspired ensemble comes with a pretty red polka dot skirt and a mouse ear headband with the iconic red bow.

Material: 100% polyester | Cleaning instructions: Machine wash cool. Line dry.

Bee first birthday outfit

HAPPYMA Baby Girls One 1st Birthday Outfit Bee Sunflower Romper and Skirt
Image: Amazon
Buying Options

You’ve been a busy bee this past year, and you and your family deserve to celebrate! Everyone will be abuzz about this bee-themed set complete with a yellow and black onesie, a tulle tutu with a bow and a matching headband.

Material: Cotton and tulle | Cleaning instructions: Hand wash only

Comfortable first birthday outfit

Hudson Baby Infant Girl Birthday Boxed Giftset
Image: Target
Buying Options

For a more casual yet still completely festive look, go for this adorable pink-and-black onesie and leggings set that comes with a birthday bib (get ready for that smash cake!) and the cutest little crown. Bonus: Those leggings can go straight into baby’s outfit rotation!

Material: 100% cotton | Cleaning instructions: Machine wash, tumble dry

First trip around the sun birthday outfit

Around The Sun Birthday Outfit
Image: PaytonsPinkBoutique | Etsy
Buying Options
Etsy|From $14.99

It’s been quite a year, and to celebrate, all the shimmer is in order! This sparkly set comes with a graphic bodysuit, a beautiful tutu skirt and a shiny bow (you can buy them individually as well) that will make your kiddo feel like the center of the universe!

Material: 100% cotton (bodysuit); tulle (tutu) | Cleaning instructions: Turn inside out, machine wash, tumble dry low

First birthday dress

Pinafore Dress In Cakes
Image: Maisonette
Buying Options

Not into graphic tees and baby bodysuits? Not a problem! For a more formal birthday bash, try this pretty pinafore first birthday dress with a playful cake pattern your child will drool over.

Material: 100% cotton | Cleaning instructions: N/A

How We Chose the Best First Birthday Outfits

You have a lot on your plate when it comes to planning baby’s first birthday party. So we decided to make it easy for you when it comes to finding the perfect first birthday outfit for your little one’s big day! We narrowed down some of the most fun and festive birthday outfits out there, no matter the theme of your party. When selecting the outfits, we considered what’s on trend, what people are searching for, the size and the material. We also made sure to read user reviews to see what real consumers have experienced when buying these outfits, and didn’t consider anything with less than an average four-star rating.

Interested in learning more about our editorial process? Read about how our team develops and reviews all articles here.

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