If you’re planning a first birthday party and want something cute, fun, and super easy to pull off, an O-Fishally One theme is a total winner.
It’s colorful, it’s playful, and let’s be real—who doesn’t love a party with adorable little fish everywhere?
Whether you’re all about DIY or keeping things simple, I’ve got plenty of ideas to help you throw a party that’s as memorable as it is fun.
O’Fishally One First Birthday Party

For Boys: Under the Sea Adventure
Use this adorable photo backdrop as an inspirational starting point:

High Chair Banner
Here’s another adorable high chair banner to inspire you:

Color Scheme
Opt for ocean-inspired colors like blues, greens, and whites, with pops of orange and yellow.

Shop This Image: Cake Topper | Fish Baby Pool | Banner | Photo Backdrop
Decorations
Set the scene with underwater-themed decorations. Think fish-shaped balloons, an “O-Fish-Ally One” banner, and table settings adorned with seashells and fishnet tablecloths.
Make it easy on yourself with this adorable party kit:


✅Love the idea of a it that includes everything you need to make party planning it soooo easy?? There are so many cute options for these complete sets here.
Snack Bar
Create a snack bar with ocean-themed treats like goldfish crackers, blue Jell-O cups, and fish-shaped cookies. Use sand buckets and shovels to serve snacks for an extra fun touch.

Here’s a fun setup idea for your snack table: Arrange treats with playful labels like “Bluegill” (blue candy), “Worms” (gummy worms), and “Driftwood” (pretzels). Add a blue drink dispenser as “Lake Water” for a creative finishing touch. Guests will love the clever details!

How cute is this dessert table? The fishing tackle box filled with treats like ‘Minnows’ (gummy fish) and ‘Worms’ (gummy worms) is so clever, and the blue cupcakes topped with fishing bobbers tie the whole theme together.
Add signs like ‘Weights’ and ‘Bait’ to make it even more fun.
Purchase ready-to-go “Bait Bar” labels:

Drink Station
Serve “Ocean Water” (blue punch or lemonade) in clear cups with cute fish straws.
Check out these drink dispensers!

One has clear punch with floating fishing bobbers, and the other is filled with blue “ocean water.” Such a fun, simple way to tie into the O-Fish-ally One theme and guests will love it!
Fishing First Birthday Cake
The cake is the centerpiece of any birthday party, and an O-Fish-ally One theme gives you so many fun options!
Here are some ideas to make your cake unforgettable:
Check out this adorable example: A beautifully piped cake with “O-Fish-ally One” signage, colorful fish decorations, and fishing bobbers makes for the perfect centerpiece. It’s a great mix of cute and creative!

How fun is this O-Fish-ally One cake setup? The smash cake features beautiful blue frosting with scales and a bobber detail, while the sheet cake ties it all together with a fishing pole design and ‘Aiden is O-Fish-ally One’ message. It’s such a cute and creative way to celebrate your little one’s big day!”

These O-Fish-ally One cakes are simple but so creative! The ombre blue frosting mimics ocean waves, and the edible fish and plants bring the underwater theme to life.
The cute ‘O-Fish-ally One’ sign and bobber toppers make them perfect for your little one’s big day. Such a fun and elegant centerpiece for any fishing-themed first birthday!

Cupcakes

Activities
Fishing Game
Set up a small fishing game where kids can “catch” toy fish with magnetic rods.

Pin the Fin on the Fish
A fun twist on the classic game with a fishy theme.

Custom Coloring Sheets

Time Capsule

Party Favors

Send guests home with mini fish bowls with toy fish, fish-shaped bath toys, or personalized ocean-themed coloring books.
These fun favors will remind them of the great time they had.
Here’s a fun idea for the favor table:

Custom Coozies

Fill These With Treats or Goldfish Crackers:

For Girls: Pink and Light Blue Magic



O’Fishally One Outfits for the Birthday Baby
Dress your little fish in style for their big day with these adorable outfit ideas:
Fish Onesie
A customized t-shirt with “O-Fish-Ally One” or “One Year Old” written in a fun font. Pair it with comfy pants or a tutu.

Choose an outfit that not only looks adorable but also allows your little one to move and play comfortably throughout the celebration.
Family Outfit

Oh Fishally One Birthday Balloon Arch for Extra Wow Factor
Create a stunning focal point at your party with a DIY balloon arch:
- Materials Needed: You’ll need a balloon pump, assorted balloons in your party colors, balloon tape or a sturdy string, and glue dots.
- Assembly: Start by inflating your balloons to various sizes. Attach them to the balloon tape or string using glue dots, alternating colors and sizes to create a visually appealing pattern.
- Installation: Hang the balloon arch above the entrance to welcome guests or behind the cake table for a festive backdrop. Secure it with hooks or tape.
- Customization: Add extra flair by incorporating fish-shaped foil balloons or attaching faux seaweed and bubbles for an underwater touch.

A balloon arch not only adds a touch of whimsy but also serves as a fantastic photo opportunity for guests to capture memories of your little one’s special day.
O’Fishally One Invitations that Set the Tone
Start the excitement early with creative invitations that reflect your “O-Fish-Ally One” fish-themed party:
Digital Invitations: Use online platforms to design and send digital invitations featuring adorable fish illustrations and ocean wording. It’s eco-friendly and convenient for guests to RSVP.

Paper Invitations: Opt for custom-designed paper invitations shaped like fish or decorated with bubbles and waves. Include all the essential details like date, time, location, and RSVP information.

Personal Touch: Add a fishy note or poem about your little one turning one and how much their presence would mean to you on this special day.

Whichever option you choose, invitations set the stage for a splashy celebration and get guests excited about the fun to come!
Photo Ideas for Your O-Fish-Ally One Party

Capture every adorable moment with these photo ideas:
Cake Smash: Set up a designated area for your little one to enjoy their first taste of cake. Get ready to snap messy, joyful photos!
Underwater Backdrop: Take photos of guests in front of a backdrop designed like an underwater scene. It’s a fun and colorful setting.
Group Shots: Gather everyone for group photos with fish-themed props like fish hats, bubbles, and nets.
Close-Ups: Capture close-up shots of the intricate details on the cake and underwater decorations.
Family Moments: Don’t forget to capture candid moments of your family celebrating together.
Instagram Caption Ideas
Share your sweet memories with these Instagram caption ideas:
- “One year of fin-tastic fun! 🐠🎉 Celebrating [Child’s Name]’s first birthday with an underwater adventure.”
- “O-fish-ally one! 🎈🐟 Our little one is turning one and we’re celebrating in style.”
- “Making a splash with [Child’s Name]’s first year. Happy birthday!”
- “Our little fish is one year old! 🌊✨”
- “Celebrating one year of joy with our little guppy. #OFishAllyOne”
More Tips for a Splashy Celebration
Music Playlist: Curate a playlist with upbeat ocean and beach songs that toddlers and adults will enjoy dancing to. It sets the perfect party vibe!
Photo Booth Fun: Create a DIY photo booth with props like fish hats, mermaid tails, and speech bubbles with fun messages. It’s a hit for capturing memorable snapshots.

Interactive Games: Organize games such as musical chairs with ocean-themed music or a fish-themed scavenger hunt. Keep the little ones entertained and engaged!

🎂Planning Your Baby’s First Birthday Doesn’t Have to Be Overwhelming
Let’s face it—planning your little one’s first birthday can feel like a never-ending to-do list. If the thought of juggling themes, guest lists, and a cake smash photo session has your head spinning, you’re not alone. But here’s the thing: having a plan can save your sanity.
You need our first birthday party planning guide – complete with guest list trackers, timeline checklists, shopping lists, menu planner, and budget-friendly tips to keep you on track. It’s got everything you need to plan an amazing party.

Have Fun Planning Your O’Fishally One Birthday Party!

With your party planning workbook in had and these ideas and tips, your “O-Fish-Ally One” themed first birthday party is sure to be a hit. Enjoy every moment of celebrating this special milestone with your little one and creating memories that will last a lifetime.
Happy planning and happy birthday to your little fish!
Save These ideas for Later!
