WARNING: The following article contains major spoilers for Avengers: Infinity War, in theaters now.
There were a lot of moments in Avengers: Infinity War (directed by Joe and Anthony Russo) that seemed fairly minor, more so when presented right before one of the film's many powerful, exciting scenes. The quieter moment still have meaning and are worth exploring, especially since some of them have helped set things up for Avengers 4, which, according to Kevin Feige, will offer a definitive conclusion to the overarching plot that has driven the Marvel Cinematic Universe thus far.
One of those smaller moments comes right after the title screen flashes. We see Tony Stark (played by Robert Downey Jr.) walking through a park in New York alongside his new wife, Pepper Potts (Gwyneth Paltrow). Stark is trying to explain his desire to have a kid after a having a dream about become a father. His decision to liken the manifestation of that dream to wetting a bed might not be a great sign, but the conversation as a whole may be a solid indication of things to come.
Though Tony may be excited to start having kids, as Pepper reveals toward the end of that conversation, she's not actually expecting and she begins to question Stark's desire, pointing to the arc reactor on his chest (which, as he admits, is no longer necessary following the events of Iron Man 3). That scene raises an interesting question: Is Tony Stark actually ready to have children? It would be far from a sudden change of heart for him; this has been something Stark's character has been slowly and subtly growing toward since the very beginning.
And this is why it would make it the perfect conclusion to a character arc that, come Avengers 4, will have spanned more than a decade.
When we were first introduced to Tony Stark in 2008, he was an eccentric billionaire who seemed to care for little else other than his close personal friends and the fun he was having. He surrounded himself with booze, gambling and beautiful women, all thanks to the money he earned from selling weapons to anyone rich enough to buy them. It wasn't until he was captured by terrorist group The Ten Rings that he began to see the kind of horror he had indirectly inflicted upon the victims of his weapons. That was the beginning of his growth. He took it upon himself to create something that could end the horror with power that could not fall into the wrong hands. That was when he made the choice to act on compassion and use his genius and his resources to benefit the world.
His business may have changed for the better, but when Stark united with the Avengers for the first time, we saw his personal flaws highlighted against the steady, dutiful Steve Rogers and the calm, thoughtful Bruce Banner. It was an interesting turning point for him because in fighting against Loki and the Chitauri, Tony proved that he could be completely selfless, a change illustrated by his willingness to sacrifice his own life to save Manhattan from nuclear destruction.