If you live near a teaching hospital, find out if they have a team.
When I worked in a Boston hospital, Dr Bettelheim was part of a team. A psychologist would do some testing of the child, a MSW would interview the parents, and a pediatrician and child psychiatrist were involved. Everyone on the team watched thru a one-way mirror. Other MDs took over for Dr B. The goal was to discover the best treatment for the child.
I hope this treatment approach still exists.