A first birthday letter to your baby needs three things. One real scene from the year, a description of who your child is right now, and one thing you want them to know when they're older. Write to the adult who will read it, keep it to a page, sign it and date it.
What should a first birthday letter to your baby say?
A first birthday letter should say what your child can't find anywhere else. Your photos already show what they looked like. The letter can tell them what the year was like from your side.
Most good letters cover the same few things.
- One scene. A single morning, bath or car ride from this year, told in enough detail that your child can picture it.
- Who they are at one. What they love, what they refuse, what makes them laugh, how they get your attention.
- What the year was like for you. One honest line is enough. Tired, scared, happier than you expected.
- Something for later. A hope, a promise or a question you want to ask them when they read it.
You don't need all four, and you don't need to be a good writer. Plain words in your own voice are enough.
What are the steps to writing a first birthday letter?
Write it in one sitting, in the week of the birthday, while the year is still close. These steps keep it short.
- Pick a starting point. Open your camera roll and scroll back through the year. Stop at the photo that makes you remember a whole day.
- Picture the reader. Write to your child at 18 or 30, not to a baby. Use names for people and places, since "Grandpa Joe's porch" will mean more later than "the porch."
- Write the scene first. Three to five sentences about that one day. What happened, who was there, what your baby did.
- Describe them now. A few specifics about who they are this week.
- Add one line about you. What this year was like for you as their parent.
- End with something for later. A hope, a wish or a question.
- Sign and date it. Write the full date and where you are. Your child will want to know.
- Decide when they open it. Any time, a later birthday, or a sealed letter for when they're grown. There's more on that below.
If you've also kept a baby book this year, our post on what to write in a baby book has month-by-month prompts. The letter is different. It's one page, written to your child, in your voice.
What can you write about in a letter to your baby?
Use these prompts if you're stuck. Pick two or three, not all of them.
- What a normal weekday looked like this year, hour by hour.
- The thing you worried about most that turned out fine.
- Something you got wrong and how you fixed it.
- What their room, your home or your street looked like.
- What things cost, what was on TV, or what everyone was talking about.
- The person who could always calm them, and how.
- What their older sibling, cousin or dog made of them.
- The moment you first felt like their parent.
- A habit of theirs you hope they never lose.
- What you'd like to ask them when they read this.
- What you want them to know about how they got their name.
- A promise you're making for the next year.
What does a first birthday letter look like?
A first birthday letter is usually a few short paragraphs, with one scene, a few details and a sign-off. The three letters below are examples we wrote for this page. They aren't real letters from real families. Change every name and detail to your own, and keep yours just as short.
Example letter to a daughter, from Mom
Dear Lily,
You turned one on a rainy Saturday. You ate the frosting off the top of your cake and left the rest for us.
This year you learned to clap, and now you clap for everything. The dishwasher finishing, the dog coming in, yourself. You hate socks. You'll only eat from the blue spoon.
The first months were hard for me. Some nights I sang the same song eleven times before you fell asleep. By spring you were sleeping through, and I missed the singing a little.
I hope you keep clapping for small things.
Love, Mom
March 3, 2026, at the kitchen table
Example letter to a son, from Dad
Dear Sam,
You're one today. You can't walk yet, but you can cruise the whole length of the couch, and you look back every time to check that we saw.
Most mornings this year it was you and me at 6 a.m. with the radio on. You liked the traffic report more than the music. I still don't know why.
Those early mornings were ours. I'd do every one of them again.
Happy birthday, buddy.
Love, Dad
June 14, 2026
Example letter from both parents
Dear Nora,
We're writing this together after you fell asleep on your first birthday.
This year you mostly lived in three places. Our bed, the baby carrier and Grandma Ruth's lap. You say "uh-oh" whenever something falls, including you.
We argued about your name for months before you were born. We still think we got it right.
Whatever you're doing when you read this, we hope you still laugh at the vacuum the way you did this year.
Love, Mom and Dad
September 2, 2026
Should a first birthday letter be opened at 18?
You can choose any opening day. If you choose 18, your child will read the letter as an adult, so it needs a little more context than a letter for next year. Your child won't remember the apartment, the babysitter or the song, so name them and explain them in a few words.
Some parents give the letter at a later birthday instead, like 5 or 10, and write a new one each year. Others keep one envelope for every birthday letter and hand over the whole stack at once. There's no right answer. Pick the day you'd most like to be in the room when they read it.
If you want to add to the letter, a time capsule works well. Put the letter in a box with the birthday card, a small toy, and a printout of the news from that day.
Where should you keep a letter to your baby for 18 years?
Keep two copies, one on paper and one digital, in two different places. A single envelope in a drawer can be lost in a move, and a single file can be lost with a phone.
For the paper copy, the U.S. National Archives' guide to storing family papers, checked on 16 Oct 2026, recommends keeping papers below 75 degrees Fahrenheit and relative humidity below 65%, and out of damp basements, garages and hot attics. It also recommends folders or boxes that are lignin-free and acid-free or buffered, and mounting papers without glue or adhesive.
For the digital copy, take a photo or scan of the letter, or type it up, and save it where you keep your other important files. Email a copy to yourself and to the other parent. If you write the letter in an app, check that you can export it.
Can you keep a letter with the photo it's about?
Yes. You can print the photo and put it in the envelope, write the letter on the back of a print, or keep both together in an app. Keeping the letter with the photo means your child sees the day you're describing.
The app we make: Our Little World is a private baby book app for iPhone and iPad. Our Little World finds your child in the photos on your iPhone and lays them out month by month. You can write a letter on the photo it's about and choose when it opens, such as any time, their 18th birthday or a day you pick. Letters and Firsts stay on your phone, and Export everything saves them as files you keep, so you can make the second copy this post recommends. Our Little World isn't for Android users, for families who want a printed book, or for anyone who needs a free plan. You can read more about using it as a baby journal.
