When models get pregnant they look like a whole different person coz they gain so much weight. Its always a shock looking at the before and after. But when a regular fat girl gets pregnant its different, most people would see her and be like "Oh hey you. Did you do something with your hair?" Most of us won't even notice and assume she just had one too many cheeseburgers hence the stomach bulge.
Date a model, but have babies with a fat woman... Save yourself the shock.