Reincarnation?

One evening when Isaac kissed an unshaven Craig good night, he recoiled a bit from the whiskers, then opted to kiss me instead. Later we were discussing the differences between the faces of men and women.

"Isaac will grow whiskers someday too, when he's a much bigger boy," I said.

"Man," Isaac corrected me.

"Yes, it probably won't happen until you're a man," I agreed.

"Next time Isaac be woman," he said.

"Boys do usually grow up to be men," I said.

"Maybe next time, Isaac grow up be woman. Maybe next time," he said.