Ok the other night I was just playing a random lion king scene in my head. (Don't ask me why I just do that sometimes). Anyway and It hit me. Think about the first scene in the second film. When timon and pumbaa are saying how they are going to teach the new baby,saying: "look at the little guy". Then rafiki corrects them by saying "it's a girl."

Ok now let's think. If we deleted that scene from the movie the story would flow and nothing would change. So why did they incorporate that in the movie? And the answer is... That's right fluffy was indeed originally supposed to be a boy,I mean think...