I might "watch-it" for little children. I don't know what their reaction might be. At least they should be watched very carefully during EMDR.
I had asked a therapist about this, and I do believe that you are right. Young children take thier time disclosing everything that happened to them. They could only handle "small doses" or they would certainly go over the edge.
EMDR may be a possibility in my son's teens.
Raising children who have been loaned to us for a brief moment outranks every other responsibility!