Question #3

I've discovered stains on two articles of clothing. The pants and shorts are white. I'm not sure what caused the stains but since Natalie has been home she's had a few accidents and spit-ups. The stains are brown in color and seem to be set for life. Do you all know what causes these? Poop? Breast milk? Formula? Spit up? If so, how can we avoid these stains from setting?