Oneder the Sea invitation wording usually follows the same order: a short ocean headline, an invite line, the child's name with a large "ONE" and "der the Sea," then the date, time, address, one optional extra and an RSVP with a reply-by date. An editable Canva template lets parents paste their own wording into a ready-made design and print it at 5x7 or text it as a mobile evite.
"Oneder the Sea" is one of the sweetest first birthday themes because the pun does half the work for you. The other half is fitting the right words around it, so guests know who's turning one, when to show up and how to reply. Here are 20 lines to copy, grouped by where they go on the card.
Headlines that set the scene
Keep the top line short so it doesn't compete with the theme name:
- Make a Splash!
- Something Fishy Is Going On…
- Come Swim With Us
- Let's Make Waves
- A Whale of a Celebration
Invite lines that lead into the theme
These sit right above the child's name and the big "ONE":
- Join us to celebrate
- Dive in and celebrate
- Please swim on over for
- Our little mermaid is turning one!
- Come splash with us at
Then the centerpiece: the name, followed by "ONE" in large letters and "der the Sea" beneath it. On a well-designed card, "ONE" is the biggest word, so the pun reads instantly.
Cute extras for babies and families
A first birthday crowd is mostly parents, grandparents and little ones, so a gentle extra line works well:
- Bring your little guppies!
- Swimsuits optional, smiles required
- Splash zone ahead: pack a change of clothes
- Your presence is the only present we need
- Cake smash at 11:30
Use just one. Too many extras crowd a 5x7 card.
RSVP lines that get replies
- RSVP to Sarah · (555) 123-4567
- Please reply by March 15 so we save you a spot on the reef
- Text Mom to let us know you're coming
- Kindly RSVP by March 15
A reply-by date about a week before the party gives you time to confirm food and favors.
Layout tips for a first birthday card
- Make "ONE" the largest text on the card, with "der the Sea" in a softer script under it.
- Put the date, time and address together in one block.
- Pick a time around naps. Late morning, like 10 or 11AM, is a popular choice for first birthdays.
- Limit yourself to two or three colors from the artwork, like teal and coral.
- If you're texting the invite, use a phone-sized version so guests don't have to zoom.
A template with the wording already in place
Our Oneder the Sea birthday invitation, a mermaid first birthday invite for girls already uses this layout: "Make a Splash!", "Join us to celebrate," the name in coral script, a big teal "ONE" and "der the Sea" beneath it. A baby mermaid and her dolphin friend swim through an aqua sea with pink coral. Every line is editable in Canva, so you can swap in any wording from this list, and it comes with a 1080x1920 mobile version for texting plus a free 18-page party planner.
The bottom line
Let "ONE" be the star, add one sweet extra, and include a reply-by date. Copy your favorite lines from this list and your Oneder the Sea invitation is done in minutes.
Frequently Asked Questions
What does "Oneder the Sea" mean on an invitation?
It's a pun on "under the sea" for a first birthday, with "ONE" standing for the child's age.
What should a first birthday invitation include?
The child's name, the age, the date and time, the address and RSVP details with a reply-by date.
Can I change the age on an Oneder the Sea template?
Yes. In an editable Canva template every word can change, so "ONE" can become "TWO" for a Two the Sea party.
Can I text a first birthday invitation?
Yes. Our template includes a 1080x1920 mobile version made for texting and social media.