The deaths of young children from COVID are pretty rare, though some have occurred in Thailand. However, dying from COVID isn't the only reason to consider vaccination for young people, as explained in the following:
Life as a young person with long COVID: “You go through so many phases of up and down, it’s like being on a rollercoaster forever”
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"In March 2020 Kitty McFarland was a fit and healthy 14-year-old. She enjoyed ballet, paddleboarding, running and netball. Then she contracted COVID-19.
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About a month later the pair attempted some very light exercise, but the relapse Kitty suffered left her bedbound for the next eight months.
“I mainly felt dizzy and exhausted. I would faint a lot and get heart palpitations; I could be just sitting around, and my heart would suddenly leap to 190 beats a minute,” says Kitty. She also developed a gluten intolerance and acute abdominal pain that caused her to faint and required several hospital stays."
https://www.who.int/europe/news/item/30-08-2022-life-as-a-young-person-with-long-covid---you-go-through-so-many-phases-of-up-and-down--it-s-like-being-on-a-rollercoaster-forever