About the baby thing.
I think it was a mistake to start these films with Mary Jane instead of Gwen Stacy. This would have allowed Gwen to die in SM1, allowed Parker to pursue MJ in SM2 (also giving him the same "dont I deserve to be happy and guilt issues" he had in SM2)and solved the damsel in distress issue these films have had.
Everyone thinks of MJ as Parker G/F but Parker had a couple before MJ came around.
Within the context of the films, with Parker and MJ being together from the beginning, a kid can work.
I mean do you want Parker to be a teenager forever?
This is one of the things that after 15 or so years (early 70s through mid 80s) began to turn me off from Marvels comic books. No passage of time.
I would prefer to see the character age over time, grow, mature,move forward through and experience life, as the films progress.
This is one of my biggest gripes with the Xmen films. Instead of seeing the team grow over time, we got 3 films that all happen within a few months time and its all over. I wanted to see the Xmen grow up together, learn to be a team and family,etc. The passage of time is important for character development.
Thats the point of having a continuing story.