What is a child called who responds no to everything?

A child who consistently responds "no" to everything may be described as oppositional or defiant. This behavior can sometimes be seen in toddlers as part of normal development, where asserting independence is common. However, if it persists beyond typical developmental stages, it may indicate oppositional defiant disorder (ODD) or other behavioral issues. It's essential to understand the underlying reasons for this behavior to address it appropriately.