Children can experience stress in similar ways to adults, but they may express their stress in different ways as their ability to describe their feelings may not match the depth of their emotions.
Children often absorb more from their surroundings than we might imagine. Overhearing adults’ concerns about things like money, jobs and their own education can translate into stress and worry.
https://www.unicef.org/parenting/mental-health/what-is-stress
https://www.childrenscommissioner.gov.uk/blog/children-and-stress-whats-worrying-them-most/