"Childhood passion" refers to an activity or interest that a person had when they were young and felt very excited or enthusiastic about. Full definition
She famously transformed her early childhood passions for collecting dolls and glass animals into a career as one of the nation's leading art collectors. (mysanantonio.com)
Isn't it it nice to revisit childhood passions & hobbies? (stylegonerogue.com)
His imagination fired, Schmidt combined stargazing with his other childhood passion: computing. (discovermagazine.com)