We want babies to cry. Crying means a baby is robust, is intact, has energy, and can communicate. Parents must try to understand this language of newborns to figure out why their baby is crying and what they can do to help. But one in five babies suffers from colic -- excessive crying that can cause extreme physical and emotional distress and is the first crisis in a parent's relationship with a child. Barry M. Lester, Ph.D., the foremost colic researcher...