China adopts the slogan "late, long and few", encouraging couples to have one child, and urging them to have no more than two
The Communist party says couples should have no more than one child
China adjusts the policy, allowing a second child for some families in rural areas and for couples who were both an only child, and in some other specified circumstances
New laws decreed to better manage the administration of the policy, including penalties for unapproved births
China adds an exemption allowing two children for families in which one parent, rather than both, is an only child
One-child policy scrapped, allowing all couples to have two children for the first time in more than three decades