The documentary Little Big Girls by director Hélène Choquette sheds light on the phenomenon of early-onset puberty. Today, it isn’t unusual to see the earliest signs of puberty in girls younger than the age of 9, though this was not the case a few decades ago. The result, inevitably, is a disconnect between the girls’ physical and emotional maturity. Far from being a marginal issue, early-onset puberty is fast becoming a worldwide public health concern. A number of causes are suspected: Could ob...