5 month old infant girl, 24 long, weighing 16lbs The baby spits up a good bit usually. Last week several family members had a stomach virus. The baby did not seem to have symptoms, although she started to have frequent bowel movements that turned a grayish silver color. What could this mean? The baby s mom did test positive as a CF carrier during pregnancy, but nothing has come back to indicate that the baby has CF. I m not sure if that is relevant.