Yet most children will begin to question it at some point - and many parents anticipate this moment with dread.
Now psychologists have identified the average age when Santa scepticism creeps in, and which children are at greatest risk of harbouring negative feelings when it does.
While most adults have fallen for the myth that Santa doesn't exist, many children still believe - even if the idea of a single individual visiting the homes of billions of children in a single night is at odds with their wider reasoning skills.
Dr Candice Mills, a psychologist at the University of Texas in Dallas and a Santa sceptic said: "Children typically begin to distinguish fantasy from reality during the preschool years, but their belief in the existence of a singular magical Santa Claus often continues into middle childhood."
Mills became interested in this phenomenon when she became. a parent and "got immersed in the world of promoting Santa Claus".
Denne historien er fra December 23, 2023-utgaven av The Guardian.
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Denne historien er fra December 23, 2023-utgaven av The Guardian.
Start din 7-dagers gratis prøveperiode på Magzter GOLD for å få tilgang til tusenvis av utvalgte premiumhistorier og 9000+ magasiner og aviser.
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Parry: Premier League would be 'sterile' without EFL
Rick Parry has accused the Premier League of undervaluing the football pyramid, arguing that without the \"variety and competition\" that come from relegation and promotion the game would become \"sterile\".
Official review: Coote faces FA investigation as Webb breaks silence on video
The Football Association has launched its own investigation into the behaviour of the referee David Coote after remarks he made about Jürgen Klopp in a video that surfaced online this week.
Match-by-match: Coote's Liverpool games as an official
Referee who has been caught on video in a foul-mouthed tirade against Jürgen Klopp officiated 21 Liverpool games. Andy Hunter takes a look at the decisions in each one
Wretched, haunted but human: a referee shaped by modern football
Is it really a surprise that an official or someone similar should end up glassy-eyed and spitting toxins on a sofa?
Hall's audition adds intrigue to England's Nations League finale
In-form Newcastle defender can show Thomas Tuchel he can be the solution to perennial problem on the left
'It's about robust planning, proper financial control'
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'People are going to see women's boxing at its very best'
The super-lightweight world champion Katie Taylor says her rematch against Amanda Serrano in Texas, as the main support act to Tyson v Paul, will be something special
Blindkilde Brown and Fujino help City avoid slip up
Manchester City maintained their 100% start in the Women's Champions League group stage as second-half goals from youngsters Laura Blindkilde Brown and Aoba Fujino were enough to beat a determined Hammarby side.
Players must cope with extra scrutiny, says Lewis
The England coach, Jon Lewis, said his players experienced a \"sharp learning curve\" about perception management in the fallout from their disastrous group-stage exit in last month's T20 World Cup.
No input from Jones in England's plan to upset Springboks
England will not be benefiting from the insider knowledge of their former Springbok assistant coach Felix Jones this weekend after it emerged that neither their players nor key staff members have been in contact with the Irishman, still supposedly employed remotely by the Rugby Football Union (RFU).