when I was in a childhood 에서
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child‧hood W3 [uncountable and countable]
I had a very happy childhood.
in/during/since (somebody's) childhood
Most infections occur in childhood.
She had been writing poems since her childhood.
childhood home/friend/experience etc (=a home etc that you had when you were a child)
childhood memories (=the memories you have of your childhood)
src : longman dic.