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7 Fun Themes to Celebrate Your Little Girls 1st Birthday


The long-awaited day is here; your baby girl is turning one! A first birthday party is more than just an age milestone; it’s an opportunity for family and friends to celebrate your little one and YOU! Parenting is hard, and a pat on the back is well-deserved for those sleepless nights and long days — so let’s celebrate! 

Deciding on a theme for your little one's big day can be tricky; your baby girl's first birthday comes with a slew of emotions, and finding the right theme to help your party go off without a hitch is something you shouldn’t have to worry about! 

When it comes to choosing the right theme, Party Source has got you covered! With over 7000 party supplies in stock and fun pieces for every occasion, let us be your inspiration for finding the best theme for the big ONE! 

Minnie Mouse

This cute and classic theme is sure to be a hit! Get inspired by Minnie’s style; think pink and polka dots! We’ve got you covered from foil balloons to cake stands and confetti, but you can take this theme a bit further by dressing up your little ones’ high-chair in a pink polka-dot skirt for the perfect photo-opt! 

Bring Disney to your backyard with an ear-making station. Let the little ones customize their pair of Minnie-ears to take home. Fill your favor bags with items for both boys and girls; Minnie temporary tattoos and signature hair bows tie in the theme and take home the fun! 


Step into a storybook with a full-blown fairy theme! All you need for this simple theme is lots of colors and a little whimsy!

A garden party is a great way to emphasize this theme, and you can elevate your space with paper lanterns! Create a statement entrance with a tinsel door curtain to transport your guests into an area adorned with butterfly decor and bright rainbow backgrounds. Decorate tables and chairs with metallic foils and pastel balloons to create that mystical atmosphere! A backdrop is a great centerpiece to showcase your baby’s cake smash or take those memorable 1st birthday photos.

Bring the magic to life with a fairy face painting station, enjoy the fun of a piñata, and send them home feeling like true fairies, with magic wands, butterfly accessories, and little notebooks to document their fairy findings!


Mermaids are all the rave right now, and little girls can’t get enough of this fun theme. Glittery sequins and beach scenery is your ticket to a perfectly planned mermaid party! 

Recreate the sea, and bring in underwater elements to elevate the theme! Backdrops will be your best friend for doing this; decorate your walls with beach themes and mermaid-style murals! Inflatable palm trees and clamshells are a fun way to bring the theme to life! Mermaids are all about magic, so make sure to tie in those sparkly elements.

Our favorite game for this theme is the underwater treasure hunt! Fill a plastic tub with mermaid treasures, like plastic jewelry and shiny things. Then cover those little gems with blue jello and let the kids take turns searching! 


Sparkles, rainbows, unicorn horns! This theme is all about color and creativity. Decorate your space with bright balloons, metallic confetti, and rainbow everything! 

A balloon arch is a statement piece and a super fun way to recreate a real-life rainbow! We also have a ton of fun unicorn theme decorations to fill your space, from unicorn balloons to pinatas and cutouts.

Here are a few of our favorite unicorn-themed party things. Unicorn cupcakes, use our unicorn cupcake stand to showcase your unique treats and get creative with the materials you use to create that statement horn! Pin the horn on the unicorn; we love this game; it's simple and fun for all ages.

Pack your goodie bags with unicorn keychains and all your piñata fillings!

Under the Sea 

This under the sea theme might be our favorite! Transforming your space into an underwater oasis makes a big splash! Fill your party planning place with many blue and green decorations, mimicking the ocean waves. Add assorted inflatable sea creatures like fish, sharks, and dolphins.

Create a ring toss game with your inflatable creatures or purchase a kiddie pool and create a fun kid-friendly fishing experience for the little ones! 

Top your cupcakes with mini shark fins or create a fun under-the-sea themed parfait by using blue food coloring to dye vanilla pudding! Top it with crushed graham crackers and beach-themed candies; this adds an extra element of creativity to your party planning! 

Pretty, Pretty, Princess

In our eyes, every little girl is a princess, which means creating the most elegant and beautiful birthday! Princess parties are all about frill, fine things, and jewelry! 

Pink will be your color for this party, decorate your tables with castle and carriage centerpieces, pink confetti, and opt for props that transform your space into a place of luxury! Roll out the pink carpet and make your birthday girl the guest of honor! Dress up your tables with princess pennants, and add a dance floor to transform your space into a royal ballroom!

Encourage your young guests to dress up as their favorite prince or princess and use a carriage photo prop to engage guests and make lasting memories! 

Birthday Barbie

This classic birthday theme has been around for years, and if we’re being honest, it just keeps getting better with age! Barbie is all about girly things; make sure to stock up on pink and purple decor, fun dresses, tiaras, and even costume jewelry and make-up! Take inspiration from all different Barbies, from Barbie Fitness Doll to Princess Barbie, and create a unique hands-on experience that lets the kids dress up and have fun! 

The Barbie dress cake is notably the most iconic birthday cake to date! An epic cake made to look like your favorite Barbies dress, with a real Barbie stuck right on top! This surprise is sure to excite your little one and make for an extra fun first cake smash! 

No matter what you choose, your baby’s first birthday is going to be a day to remember, and adding extra elements like decorating your baby’s high chair or incorporating a backdrop will make it even more special! 

You can find all of these themed accessories on our Party Source website! Let these themes be your guide to finding the best fit for you and your little one, and make sure to soak it all in; they only turn one once! 

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