More importantly, though, is that addition to the two of them being married (which we expected would happen), Paltrow is saying that Tony and Pepper do indeed have a child during Avengers 4, meaning that Pepper either was actually pregnant at the start of Infinity War or became pregnant after the movie.
Gwyneth Paltrow’s comments to the official Avengers: Infinity War magazine (via Comicbook.com) indicate that she was one of the lucky individuals who survived being wiped out by the godlike Thanos at the end of Infinity War, so she and Tony are able to continue their relationship.
Either way, assuming that Paltrow’s quote is accurate, then not only will get to see how Tony and Pepper are as parents, but it also suggests that a fair amount of time will have passed since Infinity War.