6th Birthday Girl Shirt, Mermaid Birthday Shirt, Six and Making Waves Tee, 6 Year Old Birthday Outfit, Under the Sea Mermaid Party
Printed In-House
Shop / Lil' Toddler Tees / 6th Birthday Girl Shirt, Mermaid Birthday Shirt, Six and Making Waves Tee, 6 Year Old Birthday Outfit, Under the Sea Mermaid Party

6th Birthday Girl Shirt, Mermaid Birthday Shirt, Six and Making Waves Tee, 6 Year Old Birthday Outfit, Under the Sea Mermaid Party

🧜♀️🌊 SIX & MAKING WAVES! 🌊🧜♀️ She's officially SIX and ready to make some waves! Celebrate her sixth...
★★★★★ New — First Reviews Coming Soon
$25.95
Size: 2T
Color: White
Printed by our own team
Ships in 3–5 business days
Easy 30-day exchanges
  • Mid-weight cotton that holds shape wash after wash
  • Relaxed toddler fit — room to move, room to grow
  • Printed and quality-checked by our own team
Product details

🧜♀️🌊 SIX & MAKING WAVES! 🌊🧜♀️

She's officially SIX and ready to make some waves!

Celebrate her sixth birthday with a colorful mermaid birthday shirt designed for the little birthday girl who loves sunshine, seashells, ocean adventures and everything mermaid.

Featuring a bold SIX, an adorable mermaid, tropical palms, rolling turquoise waves, seashells, starfish and bright pink details, this tee makes an extra-fun centerpiece for her 6th birthday outfit.

🎂 PERFECT FOR HER 6TH BIRTHDAY

Made for mermaid-loving birthday girls and perfect for a mermaid birthday party, under-the-sea birthday, beach party, pool party, tropical birthday celebration, sixth birthday photoshoot or special birthday-day outfit.

🌊 SIX & MAKING WAVES

The playful birthday saying makes this design different from a standard “6th Birthday Girl” tee while still making her milestone age immediately recognizable.

Pair it with a pink tutu, denim shorts, leggings, sandals and her favorite birthday bow for an adorable party look.

🧜♀️ MERMAID BIRTHDAY PARTY READY

The pink, aqua and tropical color palette coordinates beautifully with:

Mermaid decorations • Ocean balloons • Seashell decor • Under-the-sea cakes • Beach themes • Pink and turquoise party supplies

📸 PERFECT FOR BIRTHDAY PHOTOS

From posing beside the cake to opening presents and showing everyone she's officially six, this shirt was designed for those milestone birthday photos you'll want to keep.

🎁 A CUTE 6TH BIRTHDAY GIFT

A fun birthday gift idea for daughters, granddaughters, nieces and mermaid-loving girls turning six.

Six years old. Mermaid obsessed. And officially MAKING WAVES. 🌊🩷

Shipping and delivery
Most orders ship in 3–5 business days.
Returns & refunds
Easy 30-day exchanges on unworn items.
Boutique kids clothing store interior
Printed In-House. Not Outsourced.

Our Story

Printed In-House, Made With Care

Lil Croptops started with a simple frustration: kids' graphic tees that faded after three washes, felt like cardboard, and were printed who-knows-where. So we bought a press, learned the craft, and started making them ourselves.

Printed In-House

Every garment is designed, printed, and packed in our studio. No third-party print farms.

Made With Care

We choose soft, durable cottons and test every graphic for comfort.

Small Batches

We print in small runs so designs stay fresh and waste stays low.
Read Our Story →
Warm boutique workspace with apparel and printing supplies

Printed In-House, Made With Care

Why We Print In-House.

We started Lil Croptops because we were tired of ordering cute designs online and getting prints that cracked after two washes. So we brought printing in-house — every onesie and tee is produced and checked by our own team, not shipped out to a third party. It’s slower. It’s also the only way we’d put our name on it.
Read Our Story →

Parents Are Talking

What Families Are Saying

Real reviews from real parents. (We’ll add more as they roll in.)
”
★★★★★
The quality exceeded my expectations! The shirt was so soft and absolutely adorable.
Sarah M.
Austin, TX · Best Day Ever Toddler Tee
”
★★★★★
My toddler gets compliments every time she wears it!
Jenna K.
Portland, OR · Sunrise Smiles Onesie
”
★★★★★
Fast shipping, amazing customer service, and the cutest designs.
Sarah M.
Austin, TX · Best Day Ever Toddler Tee
”
★★★★★
The perfect birthday shirt! We’ll definitely be ordering again.
Marcus T.
Denver, CO · Adventure Club Youth Tee
”
★★★★★
Exactly as pictured. Great quality and even cuter in person.
Sarah M.
Austin, TX · Best Day Ever Toddler Tee
”
★★★★★
The quality exceeded my expectations! The shirt was so soft and absolutely adorable.
Sarah M.
Austin, TX · Best Day Ever Toddler Tee
4.9
Avg. rating
40+
Wash cycles tested
2–3
Day shipping
100%
Printed in-house

Common Questions

Frequently Asked

How long does shipping take? +
Orders are typically made and shipped within 2–5 business days.
Do you accept returns? +
Because each item is made to order, we do not accept returns unless an item arrives damaged or we made an error.
Can I personalize a shirt? +
Yes! Many of our designs can be personalized with names or ages.
What brands do you print on? +
We use premium, boutique-quality blanks selected for comfort and durability.Sample Brands LAT Apparel, Bella Canvas, Rabbit Skins, Gerber Premium, or other like quality premium brands.
How do I know what size to order? +
Shirts are true to size, but if you’re between sizes, we recommend sizing up.
How should I wash my shirt? +
Wash inside out in cold water and tumble dry low for the longest-lasting print.
Printed In-House

Find Their Next Favorite Tee.

Boutique graphics. In-house quality. Shipped straight to your door — usually within the week.
Shop All →
Little tees, made with big care.