Keepsake letters for children

4 November 2026

A keepsake letter is a letter written to a child to be kept and reread as they grow up: a yearly birthday letter from a parent, a letter to open at 18, or a magical letter from Father Christmas or the Tooth Fairy. The best ones are handwritten or printed on good paper, mention real details about the child at that age, are dated, and are stored together somewhere dry and dark.

Why write keepsake letters?

Children forget almost everything about being small. Photos show what they looked like; letters show who they were: what made them laugh, the words they mispronounced, the friend they couldn't live without. A letter written at the time captures details that nobody remembers ten years later, including you.

Types of keepsake letter

A letter every birthday

The simplest and most powerful tradition. Each year, write one letter about your child at that age and seal it. Give them the whole bundle at 18 or 21. Include:

• What they're like this year: their favourite things, their funny sayings, what they're brilliant at.
• Something that happened this year, big or small.
• What you're proud of.
• What you hope for them in the year ahead.

It needn't be long. Half a page a year adds up to a remarkable record. Pair it with a yearly birthday interview (see our kids' birthday traditions).

A letter to open at 18

Written when a child is born, or at a milestone such as starting school, to be opened when they're grown up. These letters tend to be longer and more reflective: what you felt when they were born, what the world was like, what you hope they'll know about themselves.

Letters for milestones

• The day they were born, or the day they came home
• First day at school
• Moving house, or a new brother or sister
• Their first lost tooth
• Starting secondary school
• Leaving home

Magical letters

Some of the letters children keep longest are the ones from Father Christmas, the Tooth Fairy or the Easter Bunny. Long after they've worked out the secret, a letter with their name on it from Father Christmas, praising them for something they really did when they were five, is a treasure. Keep every one.

For wording ideas, see our guides to Tooth Fairy letters and what to write in a letter from Santa.

What to write in a keepsake letter

If you're stuck, try these prompts:

• "Right now, your favourite thing in the world is..."
• "You make me laugh when you..."
• "This year you learned to..."
• "Your best friend is... and you love playing..."
• "You say ... instead of ..., and I hope you never stop."
• "The bravest thing you did this year was..."
• "When you grow up, you say you want to be..."
• "Something I want you to always remember is..."

Keep it specific. "You were lovely this year" is forgettable; "you insisted on wearing your wellies to Grandma's 70th" is a story they'll tell their own children.

Example: a birthday letter for a five-year-old

How to store keepsake letters

1. Date every letter, with the child's age, on the letter itself, not just the envelope.
2. Use good paper and a good pen. Heavier, acid-free paper and a pigment-ink pen hold up better over decades than thin printer paper and a cheap biro.
3. Keep them together in one box or folder per child, in date order.
4. Keep them cool, dry and dark. Not in a loft or a damp garage, and out of direct sunlight.
5. Avoid sticky tape, staples and paper clips, which can stain or rust over time.
6. Make a copy. Scan or photograph each letter, so a flood or a house move can't take everything.
7. Tell someone where they are. A godparent or grandparent should know where the letters live.

Keepsake letters at Christmas

Christmas is a natural time to write. Some families write a letter on Christmas Eve each year, read the old ones together, then add the new one to the box. Others keep every letter from Father Christmas alongside the letters their child wrote to him. Together they show how a child's handwriting, spelling and wishes changed over the years. See our guides to writing a letter to Santa and Christmas Eve traditions.