I will look into it once you upload.
One of my favorite sound effect of that movie is that they had him kept his adult voice for thoughts when he wake up as a child. Then as he first speak to someone, it rapidly turn increasingly squeaky until 'settling' to the child actor's voice, in a kind of reverse voice break. Very neat.
The version I have is quite poor VHS quality, could you upload yours if it's any better, as well as Os Trapalhoes e a Arvore da Juventude?