The 2008 Sichuan earthquake, China's deadliest disaster in three decades, killed 90,000 people, including more than 5,000 children. Losing a child is an immeasurable tragedy for parents anywhere, but in China the effect is compounded by the one-child policy. This means that if you lose your child, you're often losing your one and only child - and with it the totality of your life's emotional investment. In response to the earthquake, China's government made an exception for those who lost their only child to conceive another. One Child follows the journey of these three families as they try to restore a sense of normalcy and struggle to move past the loss of their children.