The charity challenge involves participants having a bucket of icy water tipped over their heads and making a donation to a motor neurone disease charity (the ALS Association in America, and Motor Neurone Disease Association and Macmillan Cancer Support in the UK).
After completing the challenge, participants can nominate friends to face a soaking; and although it is mainly adults who have been put forward, an increasing number of children are also getting involved.
Kingston's younger brother Zuma, five, felt that their six-month-old brother Apollo should take on the challenge, and during nine-year-old Cruz Beckham's challenge, a voice off camera suggests it's three-year-old Harper's turn next.
So far the Beckhams and the Stefani-Rossdales have decided not to let their youngest children face a soaking. But it seems that not all families are quite so protective of their toddlers, as an increasing number of parents are uploading YouTube videos of their two-year-olds taking on the chilly challenge.
One little girl sits in a frog chair in her garden as she declares she is about to do her 'Water Challenge'. The shock of cold water elicits quite a response from the girl, who shouts 'Fucking hell!' Cringe!
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In another clip a little girl dons goggles and nominates Barbie and Dora the Explorer!
In a third video two-and-a-half-year-old Lexi refuses to go inside until she can complete the Ice Bucket Challenge like her mum. But as she runs away from the stream of cold water her dad says 'Maybe she wasn't as ready as we thought!'
What do you think? Is two too young for the Ice Bucket Challenge?
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