"Vulnerable children" refers to kids who are at a higher risk of being hurt or harmed because they may have difficult life situations or lack necessary support. Full definition
We're talking about some of the most vulnerable children in society who will have already experienced trauma and neglect in their early years. (qaeducation.co.uk)
These included the closure of two children's centres, reduced nursery places, a school improvement service cut in half, and a support service for vulnerable children removed in its entirety. (bbc.co.uk)
When bus drivers do not adhere to proper bus - handling protocol or traffic laws, they put dozens of vulnerable children at risk. (childinjuryfirm.com)