10 Magical Under The Sea Baby Shower Ideas for Girl (Pastel Mermaid Theme for Summer)
Engaging Introduction
There’s something undeniably magical about an Under The Sea baby shower ideas for girl theme—especially when it’s wrapped in soft pastels, shimmering mermaid details, and the warm glow of a summer afternoon. Imagine sunlight bouncing off iridescent balloons, a dessert table dusted in seashell accents, and gentle ocean hues of blush, lavender, mint, and baby blue flowing through the decor. It feels calm, joyful, and full of wonder—just like welcoming a baby girl into the world.
I’ve planned (and attended) more ocean-themed celebrations than I can count, and pastel mermaid baby showers remain one of the most emotionally memorable. They create a soothing yet playful atmosphere that feels celebratory without being overwhelming. Whether you’re hosting in a backyard, living room, or bright summer venue, this theme naturally lends itself to beautiful photos, heartfelt moments, and cohesive decor that guests instantly fall in love with.
In this guide, I’ll walk you through practical, visually stunning Under The Sea Baby Shower ideas for girl—from decorations and food to games, balloons, table styling, and budgeting tips—so you can plan with confidence and enjoy every magical detail.
Affiliate Disclosure
This article may contain affiliate links, meaning I may earn a small commission if you purchase through them—at no extra cost to you. I only recommend items that truly enhance your baby shower planning and help create a beautiful, stress-free event.
Quick Shopping List for an Under The Sea Baby Shower
Before diving into the details, having a quick shopping list makes planning smoother and helps keep your decor cohesive. These essentials work beautifully together for a pastel mermaid, ocean-inspired summer baby shower:
- Pastel balloon arch kit (ocean colors with confetti accents)
- Mermaid-themed tablecloth in soft pastel tones
- Pastel ocean backdrop with shells and coral illustrations
- Under the sea cake toppers (mermaids, seashells, starfish)
- Ocean-themed cookie cutters for DIY treats
- Starfish and shell decor accents
- Mermaid or ocean-themed party favor bags
- Under the sea baby shower invitations set
- Centerpieces supplies (vases, faux coral, pearls)
- Pastel disposable tableware with ocean motifs
These items are easy to mix and match, budget-friendly, and versatile enough to work for both indoor and outdoor summer celebrations.
10 Under The Sea Baby Shower Ideas for a Girl
1. Pastel Mermaid Balloon Arch Entrance
A balloon arch instantly sets the tone for your celebration. Using soft pastel balloons in shades of blush, lavender, mint, and baby blue creates a dreamy underwater entrance that feels whimsical and welcoming. Adding metallic or pearl-finish balloons mimics bubbles floating under the sea, making it perfect for a summer baby shower.
This type of ocean themed baby shower decor works beautifully as a photo backdrop or entrance feature. Place it behind the gift table or dessert table to anchor the space and tie all other decorations together visually.
To recreate this look, you’ll need:
- Pastel balloon arch kit
- Balloon pump
- Mermaid or seashell balloon accents
2. Mermaid-Inspired Baby Shower Table Decor
Your baby shower table decor setup is where guests naturally gather, so make it magical. Layer pastel tablecloths with subtle shimmer, then add shell-shaped plates, pearl napkin rings, and soft ocean-toned runners. Keeping everything light and cohesive helps the theme feel elegant rather than childish.
This approach works well for both food and gift tables. It’s one of those pastel mermaid decorations that photographs beautifully and feels thoughtfully styled without being complicated.
To recreate this look, you’ll need:
- Pastel mermaid tablecloth
- Ocean-themed disposable tableware
- Pearl or shell napkin rings
3. Under The Sea Dessert Table with Cake & Cookies
A dedicated dessert table is a must for any Under The Sea baby shower ideas for girl theme. Feature a pastel mermaid cake topped with shells, coral, and a subtle mermaid tail. Surround it with sugar cookies shaped like starfish, seashells, and sea creatures in soft pastel icing.
This setup doubles as decor and food, making it both functional and visually stunning. Keeping treats bite-sized ensures guests can enjoy everything without feeling overwhelmed.
To recreate this look, you’ll need:
- Under the sea cake toppers
- Ocean-themed cookie cutters
- Pastel dessert stands
4. Soft Pastel Ocean Backdrop for Photos
A pastel ocean backdrop instantly elevates your space and gives guests a reason to take photos. Look for designs featuring coral reefs, gentle waves, and friendly sea creatures in muted tones to keep the atmosphere soft and feminine.
Pairing this backdrop with balloons or centerpieces creates a cohesive ocean themed baby shower decor moment that feels intentional and polished.
To recreate this look, you’ll need:
- Pastel ocean backdrop banner
- Backdrop stand
- Balloon clusters or garlands
5. Mermaid-Themed Centerpieces
Centerpieces help tie your tables together without overcrowding them. Clear vases filled with faux coral, shells, pearls, and soft pastel florals bring the under-the-sea theme to life while keeping things elegant.
These centerpieces are especially effective for summer showers, as they feel light and airy while still making a visual impact.
To recreate this look, you’ll need:
- Clear glass vases
- Faux coral and shells
- Pearl bead accents
6. Ocean-Inspired Baby Shower Games
Games don’t need to be loud or over-the-top. Keep them on theme with ocean-inspired baby shower games like “Guess the Baby Name,” “Mermaid Trivia,” or “Under the Sea Bingo.” Using pastel printables keeps everything visually cohesive.
Set up a small game station so guests can participate at their own pace, which works especially well for relaxed summer gatherings.
To recreate this look, you’ll need:
- Ocean-themed game printables
- Clipboards or game boards
- Pastel pens or markers
7. Under The Sea Invitations That Set the Tone
Your invitations are the first glimpse guests get of your theme. Choose under the sea baby shower invitations with soft watercolor designs, mermaids, and pastel ocean elements to set expectations early.
Matching the invitation style to your decor ensures a cohesive experience from start to finish.
To recreate this look, you’ll need:
- Under the sea invitation set
- Matching envelopes
- Pastel envelope seals
8. Sweet Ocean-Themed Party Favors
Send guests home with a small reminder of the day. Ocean-themed party favors like shell-shaped soaps, mini candles, or pastel candy bags feel thoughtful without being expensive.
Favor bags that match your pastel mermaid decorations help everything feel intentional and polished.
To recreate this look, you’ll need:
- Mermaid or ocean favor bags
- Small themed gifts
- Custom thank-you tags
9. Pastel Balloon Clusters Throughout the Space
Beyond the main balloon arch, small balloon clusters add softness and flow to your decor. Place them near seating areas, food stations, or entryways to subtly reinforce the theme.
This is an easy way to enhance your ocean themed baby shower decor without a large investment.
To recreate this look, you’ll need:
- Pastel balloons
- Balloon tape or string
- Weighted bases
10. Under The Sea Drink & Snack Station
A themed drink station with pastel lemonade, fruit-infused water, and ocean-labeled cups adds charm while keeping guests refreshed. Pair it with light summer snacks for a relaxed, welcoming vibe.
This setup blends seamlessly with your baby shower table decor setup and keeps everything functional yet beautiful.
To recreate this look, you’ll need:
- Drink dispensers
- Ocean-themed cup labels
- Pastel paper cups
How Much Does an Under The Sea Baby Shower Cost?
Budget ($50–$150)
Focus on balloons, printable invitations, DIY centerpieces, and simple table decor. A balloon arch kit and themed printables can transform a space affordably.
Mid-Range ($150–$350)
Add a custom cake, coordinated tableware, professional-looking backdrop, and upgraded centerpieces for a more polished look.
Full Themed Setup ($400+)
Includes premium decor rentals, custom signage, elaborate balloon installations, and fully styled dessert and photo areas.
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Final Thoughts
Planning an Under The Sea Baby Shower ideas for girl celebration is all about balance—soft pastels, thoughtful decor, and a relaxed summer atmosphere that lets the joy shine through. Start planning early, choose a cohesive color palette, and focus on details that feel meaningful rather than overwhelming.
With a little preparation and intentional styling, your pastel mermaid baby shower will feel magical, memorable, and filled with love—just the perfect way to celebrate your baby girl’s upcoming arrival.