I remember a particular scene from this movie from when I was a kid. A young hero and his girlfriend (princess?) Are in a spaceship going to a planet that is in the middle of a time warp where you need to fly in a specific route to get there or be lost forever. This time warp causes everyone to age rapidly. As the heroes enter the time warp the bad guys catch up and board the ship and there is a sword fight between hero and bad guy and eventually the princess(?) gives birth and the son begins fighting too. The good guys ship then makes it through and the bad guys don't. The hero and girl then look at each other then at her belly like "what the hell?"
That is all I remember, I saw the film when I was about 8 or 9 so it would have been made before 1995 but from what I remember it was probably from the 70's or 80's based on the special effects.