A challenging behavior in young children is defiance, or refusal to comply with others’ wishes.
Young children are very self-focused. Often, they do not have the ability or desire to see things from others’ point of view. In a toddler, redirection is often needed to get a child to comply with your wishes. A very stubborn child may not be easy to distract. You have to be aware of what the stimulus is that the child will react to and try to pre-empt the behavior you don’t want.
Defiance becomes too challenging when the child’s safety is at stake. For example, if the child is running out into the street, this could be seriously dangerous. In this case it might be necessary to physically restrain the child, and install child locks.