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A letter from Santa for a new big brother or sister

A new baby is the biggest event in a young child's year, and the hardest one: the attention they're used to has a new address. A Santa letter that mentions the baby — and then moves the spotlight straight back onto them — does something a parent's reassurance can't quite do, because it comes from the North Pole.

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Santa Claus
The North Pole
North Pole,
December 2026

Dear Mia,

A windy hello from the North Pole! The reindeer spent all afternoon playing tag in the fresh snow, and now they are munching oats in the stable, tired and pleased with themselves. December keeps us busy, and we wouldn’t have it any other way. The sky here turned pink at noon today, the way it does before a big snow, and every elf ran outside at once to look at it. They don’t do that for just anything.

Somehow you make ordinary days feel like small celebrations. Nobody teaches that; it’s a talent.

A new sibling turns a house into a team, and you just gained a new teammate. Being the big one is a real job, and you’re clearly good at it.

Merry Christmas! Leave the cookies out and the lights on, and listen for the bells around midnight. I’ll be the one grinning.

P.S. A carrot or two by the door works wonders. The reindeer land softer and the bells ring sweeter. Nobody dribbles on the doormat. Usually.

With love and a sleigh-bell ring,
Santa Claus

What Santa says about the new baby

The new-sibling letter acknowledges the baby by role (Santa's workshop hears about these things) and then reframes it as a promotion: they are now the resident expert, the hand-holder, the official big sibling with seniority. It names the things they've done this year that had nothing to do with the baby, and it thanks them for the patience that was asked of them — because it was a lot.

When to give it

Christmas Eve works, but earlier is kinder: the weeks with a newborn are the weeks a firstborn most needs proof that they're still seen. A letter that arrives in early December and names both the baby and them is a quiet anchor for the whole month.

One small suggestion

In the wizard's 'working on it' field, tell the truth about the hard parts — the whining, the regressions, the 'why does the baby get to scream' moments. Santa's reply treats those as the completely reasonable side-effects of a big change, which is the exact message that helps.

Questions parents ask

Does Santa mention the baby by name?

Santa speaks of 'the new baby' so the letter works whichever way you've told the story — and so nothing spoils if the name gets said wrong. Your child's own name is everywhere, as always.

My child isn't jealous at all. Still relevant?

Yes — the letter celebrates the new role rather than soothing a problem. Proud big siblings are usually the ones who carry it around and show visitors.

Can I combine it with the toddler preset?

The new-sibling preset works at any age; set the age (2–12) yourself in step 1. The typical combination is age 3–6 with the candy-workshop theme.

More letters from the North Pole

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