Candidiasis (Yeast Infection) in Children. Candidiasis, sometimes called moniliasis or a yeast infection, is an infection caused by yeast on the skin and/or mucous membranes. Candida albicans is the most common cause of the infection. Yeast is normally a harmless presence in the digestive system, diaper region, and vaginal area. But it may cause an infection when the skin is damaged or when conditions are warm and humid. This can also happen when a child has a depressed immune system.