Luke 2:52If the Son of God already existed before his incarnation, then he must have already been perfect, but how do you explain this passage? :
And the Messiah increased in wisdom and in greatness and in favor with God and men.
It seems that he was not perfect but he became perfect with time.
One more question: Did the Son of God learn to speak, or did he already speak as a baby?
And Jesus grew in wisdom and stature, and in favour with God and man.
That passage is speaking of Jesus as a young boy of about twelve. It does not say he wasn't perfect, just that his wisdom and stature were not fully mature but grew as it does in all children.
And I think the question about whether he could speak as a baby is ridiculous and a waste of time.