It can be inferred from the discussion on intervention in the text that the most effective protocol for treating children with intellectual developmental disorders is:

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The most effective protocol for treating children with intellectual developmental disorders is a comprehensive protocol that focuses on early intervention, is multi-dimensional, and is multi-method. This approach takes into account the individual needs of the child and involves a combination of interventions such as behavioral, occupational, speech, and physical therapy. Additionally, it involves the caregivers in the intervention process and provides support and training to them to help them better respond to the needs of their child. This approach has been proven to be effective in improving the child's overall functioning and quality of life.

It Can Be Inferred from the Discussion on Intervention in the Text