Why can my child never sit still? Activity levels from toddler to teenager

The short answer

High activity is common in young children, so movement alone cannot identify ADHD. Clinicians look for a persistent pattern that is more marked than expected for the child’s age and development, occurs in more than one important setting and causes meaningful impairment. Visible running and climbing often become less prominent with age on average, while restlessness, fidgeting, excessive talking or difficulty staying with low-movement tasks may remain. The goal is not stillness everywhere. Identify when movement helps participation, when it creates a barrier or risk, and which environmental changes let the child learn and take part.

• Activity must be considered in relation to age, development, setting and demand.
• A lively toddler or a child who moves after a long school day does not have ADHD on that evidence alone.
• Hyperactivity can include fidgeting, leaving a seat, talking, internal restlessness or difficulty moderating activity.
• Visible hyperactivity tends to reduce with age at group level, but individual paths vary.
• Movement can support attention and regulation; stillness should not be the automatic goal.
• Persistent impairment across settings deserves discussion with school, health visitors or the GP.