The psychic in Australia was so worked up about Claire's baby. One day he is emphatic that only she must raise the baby. The next day he changes his tune and insists she gets on the plane headed...I think he knew where. I think either he sensed the end of the world coming, and Aaron as a potential messiah, or else Widmore somehow got his hooks in the psychic and manipulated him to change his tune. Regardless, I think Claire remembers this message; in spite of the fact that she gave her baby to Kate, I believe she knew he was the bargaining chip. Somehow she sensed that if Aaron was separated from her, that destiny, or fate, or maybe the Island would make sure they were reunited...

Or is Aaron somehow to be used by Widmore to track the O6 when they return to the Island?