At what age should a child with autism start occupational therapy?

As early as possible. Children as young as 18 months can begin OT once early signs of ASD appear. The strongest gains happen between ages 2 and 6, when brain plasticity peaks. However, children diagnosed later, at ages 7, 10, or even into teens, still benefit significantly. Starting OT within 3 months of diagnosis leads to faster functional gains than waiting.