I don't think you should wait until considering marriage to introduce the child. Probably when the relationship starts getting serious. If I went out with someone who didn't like my kids, I'd rather know at the beginning so I'm not wasting my time on her.
Just MO.
M-43 W-40 2D - 9 and 5
Emotion, yet peace. Ignorance, yet knowledge. Passion, yet serenity. Chaos, yet harmony. Death, yet a new life.