Kids Halloween Costume for Ages 2-8

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Kids Halloween Costume

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A kid is wearing a blue sesame street onesie resembling Cookie Monster.

Sonic the Hedgehog™ Kids Onesie

$49.99

(20 reviews)

My Little Pony™ - Firefly Kids Onesie

$49.99

(20 reviews)

Child wearing a colorful Patrick onesie with a hood on a white background

My Little Pony™ - Bluebelle Kids Onesie

$49.99

(20 reviews)

Child wearing a Superman-themed onesie with a red cape on a white background

Kids Halloween Costume Ideas for Ages 2 to 8

Looking for a kids Halloween costume for your younger child? OppoSuits' kids Halloween costume collection includes character onesies like Sonic the Hedgehog™, SpongeBob™, and My Little Pony™, animal onesies like dinosaurs and sharks, and boys' suits like Super Mario™ and Pokémon, all sized for kids ages 2 to 8.

Why Choose a Kids Halloween Costume from OppoSuits

Two costume formats: a full onesie for the most immersive look, or a jacket-and-pants suit version, like Super Mario™ or Pokémon, for a more wearable costume.
Officially licensed designs from Avatar: The Last Airbender™, DC Comics, Minecraft™, My Little Pony™, Nickelodeon™, Pokémon, Sesame Street™, Sonic the Hedgehog™, SpongeBob™, Super Mario™, and Warner Bros.
Animal onesies too: not every costume is a licensed character, options like Walrus, Dinosaur, Shark, Giraffe, Otter, Panda, and Lobster work well for kids who'd rather be an animal than a character.
Sizes 2-4Y and 6-8Y, made specifically for younger kids.
Easy to coordinate for siblings or friends: pick matching onesies, like the two My Little Pony™ designs (Firefly and Bluebelle), for a group costume.

Good for

Halloween parties
Trick-or-treating
School costume days
Costume contests

What to check before you buy a kids Halloween costume

A few things to check before you order, so the costume fits and suits the event.

Styles	Character and animal onesies, boys' suits, and a boys' shirt
Licenses	Avatar: The Last Airbender™, DC Comics, Minecraft™, My Little Pony™, Nickelodeon™, Pokémon, Sesame Street™, Sonic the Hedgehog™, SpongeBob™, Super Mario™, Warner Bros.
Sizes	2-4Y and 6-8Y, for kids ages 2 to 8
Delivery	See current delivery times on our shipping page

Onesie or Suit for Your Kid's Costume?

A onesie, like Cookie Monster or a Dinosaur, is the go-to pick for younger kids who want to be fully in-character and comfortable for a whole evening of trick-or-treating. A suit version, like Super Mario™ or Pokémon, works well for a kid who wants a costume that still looks a bit more put-together, useful for a school event or a family gathering where the dress code isn't quite as relaxed.

Looking for a specific style? Browse all Kids Onesies, just the Animal Onesies, or Halloween Suits for Boys. Got an older kid? Check out the Halloween suits for older kids and teens.

Frequently asked questions about kids Halloween costumes

What sizes do kids Halloween costumes come in?

This collection is sized 2-4Y and 6-8Y, for kids ages 2 to 8.

What's the difference between the onesie and suit costumes?

A onesie is a single, all-in-one costume piece for a full character look, while a suit reworks the same character into a jacket-and-pants set for a more wearable, put-together costume.

Is there a Halloween costume collection for older kids?

Yes, check out Halloween suits for older kids and teens for bigger sizes.

Are there costume options that aren't licensed characters?

Yes, animal onesies like Walrus, Dinosaur, Shark, Giraffe, Otter, Panda, and Lobster offer a non-licensed alternative to the character designs.

When will my order arrive?

Delivery times can change, so check the current estimates on our shipping page before you order.