My son when he was 3-4 said he was an old man named Bill. I would ask him how he knows he was an old man named Bill? He would tell us he climbed out of his grave as a baby.....
They only way to limit PC would be to pitch to contact. That would result into possibly more base runners and more pressure pitches, maybe pushing him down to 5, 5.1 innings... Let him develop and strech his arm out as he goes.