Is this defiance, or can my child not do it yet?

The short answer

A child may understand an expectation and still be unable to meet it reliably. The missing part could be language, planning, memory, motor skill, waiting, switching, emotional regulation or knowing how to begin. Capacity also changes with pain, sleep, hunger, stress and the demands of the setting. Do not decide from the intensity of the refusal. Break the task into steps, check what the child understood, compare easier and harder conditions, and offer enough support to reveal the sticking point. A child may also dislike a task or test a limit; understanding that does not remove the boundary. State what is fixed, reduce unnecessary load, teach or supply the missing step and keep unsafe behaviour out of bounds.

• Knowing what to do is different from being able to do every step.
• Skills can be real and still become unavailable under load.
• Task analysis and small support trials reveal more than arguing about attitude.
• A reason for refusal does not make unsafe behaviour acceptable.
• Support should increase access, not require distress as proof of need.