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Are you ready to dive into planning a splash-tacular mermaid birthday party for your little one? Creating an unforgettable mermaid-themed celebration can be both fun and easy, especially when you’ve got a guide like this one! We’re talking about whimsical decor, dazzling treats, and plenty of activities that’ll have everyone feeling like they’re swimming under the sea. Whether your child is obsessed with mermaids or simply loves everything ocean related, this guide has everything you need for a fin-tastic birthday bash!

Let’s start planning this under-the-sea adventure step by step!

Mermaid Birthday Party Invitations

The perfect mermaid party starts with an enchanting invitation. This is your chance to set the tone for the entire event. Picture an invite decorated with soft pastel hues of aqua, lavender, and pink, maybe even a splash of iridescent glitter or a mermaid tail silhouette. These little touches help spark excitement even before the big day arrives. And if you’re feeling crafty, consider adding some seashell confetti inside the envelopes for a fun surprise.

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Under The Sea Party Invitation

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Under the Sea Invitation

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Editable Mermaid Invitation

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Mermaid Birthday Invite

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Mermaid Birthday Invitations

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Under the Sea Birthday Invite

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Under the Sea Welcome Signs

Nothing says “under-the-sea adventure” like a welcoming entrance. A well-designed welcome sign can transport your guests straight to the ocean floor from the moment they arrive. Think about a sign that reads, “Welcome to [Your Child’s Name]’s Mermaid Adventure!” surrounded by flowing seaweed designs, glittery starfish, and maybe even a mermaid tail or two.

To make this entrance even more magical, you could set up a balloon arch in sea-inspired colors like teal, lavender, and pearl. You could even sprinkle sand and seashells around the entrance to create that true beach vibe. And if you have a little extra time, a homemade foam board sign can be a fun pre-party craft!

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Mermaid Birthday Welcome Sign

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Under the Sea Welcome Sign

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Mermaid Party Welcome Sign

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Ocean Shell Welcome Sign

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Mermaid Birthday Party Backdrop

For every memorable party, there’s a picture-perfect backdrop, and a mermaid-themed one should be nothing short of dazzling. Whether you’re hosting indoors or outdoors, a backdrop filled with shimmery sequins or ocean waves is a must for capturing those Instagram-worthy moments. You could opt for a full balloon wall with seaweed, mermaid tails, and sea creatures, or go for a fabric backdrop with ombre blues and greens that mimic the ocean’s depths.

If you want to add a personal touch, create a mermaid scene using cutouts of coral, fish, and perhaps a sunken treasure chest. This gives guests the feeling of being part of an underwater adventure, making it an instant hit for group photos.

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Inflatable Seashell

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Sequin Shimmer Backdrop

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Mermaid Beach Ball

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Natural Fish Net Party Decor

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Mermaid Balloon Garland

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Mermaid Birthday Decoration

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Mermaid Balloon Garland Arch

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Silver Tail Mermaid Balloon

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Seaside Foam Decoration

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Mermaid Arch Backdrop Cover

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Mermaid Balloon Tower Number

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Giant Seahorse Balloon

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Curtain for Mermaid Birthday

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Mermaid Balloon Decoration

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Mermaid Birthday Banner & Garlands

Banners and garlands are key to setting the party mood. A “Happy Birthday” banner with a mermaid twist, like iridescent letters or shimmering scales, is a must-have. Adding dangling garlands of seashells, bubbles, and starfish across walls or over the dessert table can further elevate the theme. You might also consider a personalized name garland, which makes for a sweet keepsake once the party is over.

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Happy Birthday Banner

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Mermaid Tail Birthday Banner

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Mermaid Birthday Party Banner

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Strings Under The Sea Banner

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Mermaid High Chair Banner

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Mermaid Highchair Banner,

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Jelly Fish Paper Lanterns

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Ocean Shells Hanging Banners

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Table Setting and Centerpieces

Imagine tables dressed in iridescent tablecloths, adorned with sparkling seashell centerpieces, and sprinkled with a touch of glitter to mimic ocean waves. The details of the table setting can make guests feel as if they’re dining at an ocean palace. Use mermaid-themed plates, cups, and napkins to create a cohesive look. For a special touch, add seashell place cards, pearl-studded napkin rings, or mini treasure chests filled with chocolate coins at each seat. These little details not only enhance the decor but also double as delightful surprises for the guests.

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Sequin Table Runner

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Mermaid Birthday Party Supplies

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Fish Net and Tablecloth Set

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Holographic Seashell Plates

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Mermaid Party Decorations

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Mermaid Party Table Runner

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Mermaid Party Supplies

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Holographic Blue Paper Plates

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Mermaid Fish Net Table Runner

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Mermaid Letter Centerpiece

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Mermaid Birthday Dinnerware

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Mermaid Tableware Set

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Mermaid Birthday Cake

Now, let’s talk about the highlight of any birthday—the cake! A mermaid-themed cake can be as elaborate or simple as you wish, but it should definitely make a statement. You could go with a cake shaped like a mermaid tail, complete with glittering scales and ombre icing in sea-inspired colors. Or, if you’re feeling less ambitious, a simple cake adorned with edible seashells, pearls, and ocean waves can still make a splash.

If you’re not a baker, most local bakeries offer pre-made mermaid cakes that you can embellish with edible glitter or a custom topper. Either way, your little mermaid is sure to be thrilled!

Mermaid Cake Toppers

The right cake topper can transform any cake into a mermaid masterpiece. You can choose from glittery mermaid tails, edible shells, or even a personalized topper with your child’s name. Mermaid figurines are another fun option, adding an extra touch of magic to the dessert table. Whatever you choose, a standout topper makes the birthday cake truly memorable.

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Shell Sequins Number Candles

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Under the Sea Cake Topper

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Mermaid Cake Topper

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Mermaid Birthday Cake Topper

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Under the Sea Cake Topper

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1st Birthday Cake Topper

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Mermaid Kit Decoration

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Under the Sea Cake Decoration

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Mermaid Acrylic Cake Topper

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Mermaid Cake Decoration

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Mermaid Birthday Cupcakes and Cake Pops

Cupcakes and cake pops are the perfect addition to any mermaid-themed dessert table. They’re fun, easy to eat, and can be decorated in so many creative ways. Consider cupcakes topped with mini mermaid tails or seashells, or cake pops decorated to look like shimmering pearls. Ombre frosting in ocean colors or sprinkles that mimic seaweed can also enhance the theme.

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Mermaid Cupcake Toppers

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Mermaid Face Cupcake Toppers

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Mermaid Tails Cupcake Toppers

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Mermaid Cupcake Toppers

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Mermaid Birthday Party Decor

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Mermaid Tail Cupcake Toppers

Mermaid Birthday Cookies

Cookies are not only tasty treats but also cute additions to the party decor. You can create a variety of cookie shapes, like mermaid tails, seashells, starfish, and clams with candy pearls inside. Decorating these cookies with colorful icing and edible glitter makes them a visual treat, too.

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Mermaid Birthday Sugar Cookies

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Sea Animal Cookies

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Mermaid Custom Cookies

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Mermaid Birthday Cookies

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Under The Sea Cookies

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Mermaid Themed Sugar Cookies

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Little Mermaid Birthday Cookies

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Mermaid Themed Cookies

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Mermaid Purple Cookies

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Mermaid Royal Icing Cookies

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Mermaid Birthday Party Favors

Every mermaid party deserves to end with a splash, and that means sending guests home with a touch of mermaid magic. Popular favor ideas include jars of “mermaid slime” (think sparkly blue goo), seashell necklaces, or small bottles of “mermaid potion” (sparkly bubble bath). If you’re looking for something practical, you can offer mermaid pens or stickers as a fun parting gift.

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Mermaid Slime Kit

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Mermaid Birthday Party Boxes

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Mermaid Birthday Goodie Bag

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Custom Mermaid Play Dough

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Mermaid Party Favors Bags

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Seashell Gift Bag

Mermaid Outfits

The birthday star deserves to look the part, and so do the guests! Mermaid outfits can range from sparkly tail skirts and tutus to themed t-shirts with shell designs. The more shimmer, the better! You can even make shell crowns as a pre-party craft or provide them as party favors for an extra special touch.

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Mermaid Tutu Dress

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Blue Mermaid Dress

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Baby Girl Mermaid Jumpsuit

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Mermaid Ruffle Dress

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Mermaid Shirt & Bottom

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Mermaid Family Birthday Shirts

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Mermaid Birthday Party Games

Games are a must for keeping the party fun and engaging. Here are a few that fit the mermaid theme:

  • Pin the Tail on the Mermaid: A spin on the classic party game, this one is always a hit with younger guests.
  • Mermaid Treasure Hunt: Hide small treasures like coins, shells, or mini toys for the kids to find. You could use a treasure chest as the prize for the winner.
  • Musical Shells: This is like musical chairs, but with seashell cushions placed on the floor. It’s a fun, mermaid-themed twist on a classic game.

These games not only add to the fun but also help keep the kids entertained throughout the event.

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Pin The Tail on The Mermaid

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Mermaid Party Coloring Poster

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Mermaid Birthday Party Placemat

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What’s Your Mermaid Name?

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Final Thoughts on the Mermaid Birthday Party

Planning a mermaid birthday party is truly a magical experience—both for you and your little one! With shimmering decorations, ocean-inspired treats, and fun games, you’re sure to create a celebration filled with joy and wonder. Remember, the most important part of the day is seeing your child’s eyes light up with excitement, whether it’s from the moment they see the mermaid cake or when they find the hidden treasures during the hunt.

Don’t stress over perfection—after all, no under-the-sea adventure is complete without a few waves along the way. Embrace the unexpected, laugh through the chaos, and enjoy the little moments that make this day truly special. In the end, it’s the love, effort, and memories created that will make this mermaid birthday party one your child will cherish for years to come. So, gather your seashells, put on your sparkliest outfit, and get ready for an unforgettable under-the-sea adventure!

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If you buy something from the links on this page, I may earn a commission. Think of this as my coffee fund—at no extra cost to you! Your support helps keep this mama awake after the baby finally falls asleep, allowing me to create and share great content with you. Thanks for fueling my late-night writing sessions!