This chapter analyses child vulnerability in two major crises: the COVID-19 pandemic and climate change. The strategies of children during the pandemic in Switzerland, and children’s agency in climate demonstrations, are captured in an online survey and in the speeches of Greta Thunberg. This shows that vulnerability is bound to how social arrangements – including human rights – mitigate natural frailty, and it advocates for better inclusion of children’s rights and agency in participatory public policies.