In this feature documentary, director Hélène Choquette sheds light on the phenomenon of early-onset puberty in girls. 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. A number of causes are suspected: could obesity and exposure to environmental contaminants, for instance, be to blame? The physical, psychological and psychosocial repercussions on young girls results in a disconnect between their physical and emotional maturity. Far from being a marginal issue, early-onset puberty is fast becoming a worldwide public health concern. Little Big Girls alerts us to the need to adapt, as a society, so as to minimize the impact of this phenomenon on our children.