21 First Birthday Outfits Just as Special as Your Tot

This major milestone is worth dressing up for.
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By Emily Platt, Associate Editor
Updated August 20, 2019
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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 first 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 unicorn 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.

Image: Courtesy Disney

Mickey Mouse First Birthday Outfit

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 faux vest and tie design?

Buy it: Disney Baby Boys’ Mickey My First Birthday Creeper, $20,

Image: Courtesy Sesame Street

Dressy First Birthday Outfit

Here’s a more versatile (and dressy) option your little one can wear well beyond their birthday. The set comes with a fancy patterned button-down, colorful pants and striped suspenders. Because there’s nothing quite like a baby in suspenders.

Buy it: Cat & Jack Baby Boys’ Poplin Top and Twill Pants Set, $16,

Image: Courtesy Cat & Jack

Dinosaur First Birthday Outfit

This dinosaur first birthday outfit is bound to cause an up-roar of giggles and smiles. The “one-a-saurus” onesie pairs perfectly with the prehistoric-patterned pants.

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Buy it: Averylee Baby Dinosaur Baby Boys First Birthday Outfit, starting from $32 for a bodysuit and shorts,

Image: Courtesy Averylee Baby

Lumberjack First Birthday Outfit

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 buffalo check “one” bodysuit (and coordinating jeans with plaid patches) makes an excellent ensemble for a fall or winter birthday.

Buy it: Cuddle Sleep Dream Baby Boy 1st Birthday Outfit, $44 for a bodysuit and jeans,

Image: Courtesy Cuddle Sleep Dream

Monster First Birthday Outfit

Pay tribute to your lovable “little monster” with this sweet, quirky first birthday bodysuit. It comes with either short or long sleeves depending on the season. Plus, you can get it personalized with baby’s name.

Buy it: SKK Design Baby Monster Boy First Birthday Outfit, starting from $17,

Image: Courtesy SKK Design Baby

Twin First Birthday Outfits

Shopping for two? You can’t go wrong with matching twin first birthday outfits. These fun, fishing-inspired “the big one” bodysuits will reel in compliments.

Buy it: SKK Design Baby Twin Boy First Birthday Outfits, starting from $32 for 2 matching bodysuits,

Image: Courtesy SKK Design Baby

Unique First Birthday Outfit

This “one-der boy” tee shirt and graphic pants set was made for cool kids.

Buy it: Me and Reekie One Der Boy 1st Birthday Shirt, $32,; Me and Reekie One 1st Birthday Shorts or Pants, starting from $32,

Image: Courtesy Me and Reekie

Simple First Birthday Outfit

Get this sporty, soft gray romper printed with baby’s name and the number one on the back jersey-style.

Buy it: 2 Trouble Boys 1st Birthday Romper, $33 for the front and back printed,

Image: Courtesy 2 Trouble Boys

Whimsical First Birthday Outfit

Outfit your “wild one” in this Where the Wild Things Are-inspired bodysuit. It’s printed with the number one, a crown bearing baby’s name and the festive phrase “let the wild rumpus start.”

Buy it: 2 Trouble Boys Wild One 1st Birthday Outfit, $30 with baby’s name,

Image: Courtesy 2 Trouble Boys

Dapper First Birthday Outfit

This tiny “tuxedo” is as cute as they come and also suits the special occasion.

Buy it: Fairy Baby Boy Gentleman Outfit Formal Romper, starting from $17,

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.

Image: Courtesy Fairy Baby

Minnie Mouse First Birthday Outfit

Disney lovers, this one’s for you—especially if a birthday trip to the Magic Kingdom is in the works! The Minnie Mouse-inspired ensemble comes with a sparkly gold bodysuit, a fun pink tutu and, naturally, a headband complete with bow-adorned mouse ears. Get it customized with your child’s name for an extra-special touch.

Buy it: My TuTu Cute Boutique Personalized Pink and Gold Minnie Mouse First Birthday Outfit, starting from $47 for the 3-piece set,

Image: Courtesy My TuTu Cute Boutique

Unicorn First Birthday Outfit

Celebrate your little miracle with the mystical creature that symbolizes miracles: the unicorn! This first birthday tutu outfit is adorably enchanting.

Buy it: Popatu One Unicorn Tutu Bodysuit, $28,

Image: Courtesy Popatu

Mermaid First Birthday Outfit

Or, go all out with this equally magical mermaid first birthday outfit. With its seashell sequin bodice and scaly patterned bottom, this romper is just “extra” enough for your little drama queen.

Buy it: Peanut and Tot Mermaid First Birthday Outfit, starting from $31,

Image: Courtesy Peanut and Tot

My First Birthday Outfit

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 headband!

Buy it: Baby Aspen My First Birthday Bodysuit, Tutu and Head Wrap Set, $40,

Image: Courtesy Baby Aspen

Princess First Birthday Outfit

Treat your newly minted tot like royalty with this pink and gold princess first birthday outfit. The baby bodysuit features a crowned number one; the set also includes a playful polka dot tutu.

Buy it: Fun Munchkin 1st Birthday Girl Outfit, starting from $30 for a top and tutu,

Image: Courtesy Fun Munchkin

Donut First Birthday Outfit

You donut know how much we love trendy donut-inspired designs. This baby first birthday outfit set includes a “one” onesie (the “o” being a donut), a donut-patterned skirt and a coordinating headband.

Buy it: Peanut and Tot Donut Girls First Birthday Outfit, $50 for the 3-piece set,

Image: Courtesy Peanut and Tot

Floral First Birthday Outfit

Not into graphic tees and baby bodysuits? Not a problem. For a more formal birthday bash, try this pretty floral dress.

Buy it: Frais Embroidered Mesh Dress, $34,

Image: Courtesy Frais

Punny First Birthday Outfit

Celebrating in the summer? How about this ultra-adorable “one in a melon” watermelon-inspired first birthday outfit? We’re always here for a good pun, not to mention an uber-cute design.

Buy it: My Little Bow Peeps Shop One in a Melon Outfit, starting from $18,

Image: Courtesy My Little Bow Peeps Shop

Romper First Birthday Outfit

We’re thoroughly obsessed with this fashion-forward “one” romper. It’s got the sweetest ruffle details.

Buy it: MK’s Boutique Yellow Baby Girl First Birthday Outfit, $35,

Image: Courtesy MK’s Boutique

Fancy First Birthday Outfit

Here’s another pick for parents looking for a formal first birthday outfit. The party dress is finished off with an elegant silver bow.

Buy it: Bonnie Baby Girls Short Sleeve Jacquard Party Dress, starting from $16,

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