"Colic" Means "I don't know why your baby is crying"

The strict medical definition of colic is a condition of a healthy baby in which it shows periods of intense, unexplained fussing/crying lasting more than 3 hours a day, more than 3 days a week for more than 3 weeks. There’s that word there, unexplained. For years I thought this word “colic” described a phenomenon that was understood and therefore natural. The etymology of the word, pertaining to “disease characterized by severe abdominal pain” in the early 15th century suggests the infant...