What should I write in a letter to my baby on their first birthday?

Write from where you are right now: one scene from today, one memory from the year, one wish. Don't aim for polish — your child will want your actual voice. Even three honest sentences are worth sealing.

How long should a first-birthday letter be?

As long as it wants to be. A single paragraph with one true thing in it beats two pages that never get written. Most parents write between half a page and two pages.

How do I seal a letter so my child reads it later, not now?

In Lunita you choose a future unlock date when you write the letter — the app locks it for everyone, including you, until that date. With paper, seal the envelope, write "Open on [date]" on the front, and tell a second person where it is.

Can I add a photo to the letter?

Yes. In Lunita you can seal one photo alongside the words. It travels with the letter and is revealed at the same moment when the unlock date arrives.

Should I write the first-birthday letter to who my child is now, or to who they'll be?

Both, but lean toward now. Write who they are at one — their obsessions, sounds, the look on their face. The future version will love discovering a portrait of the baby they no longer remember being.

Is the letter feature in Lunita free?

Writing and sealing letters is part of Lunita's free core. There is also an optional Premium tier for additional features.

What to Write in a Letter to Your Baby on Their First Birthday

Your baby just turned one. The year is already blurring at the edges — write it down now, while you can still feel it. This letter doesn't need to be long or polished. It needs to be yours.

Why the first birthday is the right moment to write

At one year old, your baby is entirely themselves — you've had a full year to discover who that is — but they can't read this yet. That's the gift: you can write the whole truth, without softening it. The exhaustion, the disbelief, the specific kind of love that makes no sense and every sense at once. The person reading this letter one day will want all of it.

There's also a practical reason. Memory degrades faster than parents expect. The small things — the sound of their first belly laugh, the exact way they reached for your face, the thing they called the dog — are already fading. A letter locks them in place.

What to put in a first-birthday letter: 10 prompts

Pick two or three. Even one complete thought makes a letter worth keeping.

The moment I first really saw you — not a newborn, but you — was …
Right now your favourite thing in the world is … (We have no idea why.)
The sound I want to remember forever: …
The night everything felt impossible, what got me through was …
Something you've already taught me: …
The person you look at like they hung the moon is …
One thing about this year I never want to forget: …
What I was afraid of before you came, and what I know now: …
The world you were born into looks like this right now: …
One thing I hope for you — just one — is …

A simple structure that works

You don't need a plan. But if a blank page stops you, this three-part shape helps:

Right now. One scene from today: where you are, what your baby is doing, what the light looks like. Anchor the reader in this exact moment.
The year. One or two things that happened. Not a summary — one specific memory, in a sentence or two.
A wish. One sentence about who you hope they become, or what you hope they keep. Short is fine. Short is often better.

That's it. Three paragraphs. Done. You can write more, but you don't need to.

How to seal it so it stays

A letter you write and leave in a drawer will probably be read tonight. Part of what makes a time-capsule letter meaningful is that it genuinely waits — unopened, unedited — until the right moment.

In Lunita's letter feature, you write the letter, choose a future date — your child's next birthday, or years away — and seal it. Once sealed, the letter is locked for everyone, including you, until that date arrives. No peeking. No going back to tidy a sentence. A wax-seal ceremony closes the letter the moment you save it, and it shows only as "a sealed letter" in Keepsakes until the unlock date. You can also attach a photo to seal alongside the words. Writing and sealing letters is part of the free core; optional Premium features are available separately.

If you prefer pen and paper, seal the envelope and write the date on the front — then tell someone else it exists. The second person is important.

A short example

"You're one today. I'm sitting on the kitchen floor while you bang a wooden spoon against a pot, because that was the only way to get five minutes to write this. You are absolutely delighted. That sound — total joy at a pot and a spoon — I want to carry it with me always. You don't know yet that today is a big day. You just know there's a pot. I love that about you. Happy birthday, little one."

Notice: no profound sentences. Just a true moment. That's everything.

Sealing a letter for later birthdays too

The first birthday letter doesn't have to be the only one. Many parents turn it into a small ritual — one letter, once a year, sealed until the next birthday. By the time a child turns eighteen, they might have seventeen letters waiting: a whole childhood, written in real time by someone who was living it. If you're thinking that far ahead, a letter for the 18th birthday is a different kind of writing — and worth reading now, even if the date is far away. For more on what makes a letter to a child feel real, see how to write a letter to your baby.