how often do you fight with your significant other?

we've been together for 2 years, lived together a year and a half of that, and we have a 6 month old together. planning on getting married next year. we get in these little fights- he says something rude and I get mad, I tell him to stop doing something and he says I'm always bitching, he'll call me a brat, things like that. we don't have to worry about either of us cheating or arguments about other guys/girls, it's just little arguments about the way we talk to each other or something we've done. he will go in the living room and play a game until he passes out and ends up sleeping on the couch then in the morning, we're both good. I don't think we've ever spent more than a couple of hours mad at each other. I know all couples fight or have disagreements, BUT how often is too often? is it a red flag that we shouldn't be getting married or am I just looking too far into it?