God is on record stating that the consequence of parents' crime can be transferred to their children.That implies a life before that one...how else could he have sinned? Jesus doesn't even correct the suggestion of a previous life in his answer he just says that he didn't sin.
Deuteronomy 5 9"For I, the Lord your God, am a jealous God, visiting the iniquity of the fathers upon the children to the third and fourth generations of those who hate Me, 10 but showing mercy to thousands, to those who love Me and keep My commandments."