White Stools More Condition_symptoms My One Year Old Has White Stools?

My one year old has white stools? - white stools more condition_symptoms

My son has white stool had about a week. We were told to go the ER if you call after hours doc at the weekend. Tests on Sunday and viral gastroenteritis Shigella were negative. Doctors do not know what could be. He is otherwise healthy, but has a slight cold, was more than usual soda and a little picky. He did not try any new foods. No idea what might be with him?