Touted by Oprah several years ago, the Dunstan System seems to be catching on as a way for modern moms to understand what their infants are wailing about. According to Priscilla Dunstan, it’s a simple language of five distinct sounds that signal hunger, tiredness, a need to burp, lower abdominal gas, and discomfort. The System (2 DVDs, a booklet, and a reference chart) is $39.95 at dunstanbabylanguage.com