India faces deepening demographic divide as it prepares to overtake China as the world’s most populous country

India's entrenched north-south divide is growing as its population changes, with serious social and political consequences

The cry of a baby born in India one day next year will herald a watershed moment for the country, when the scales tip and India overtakes China as the world's most populous nation.

Yet the story of India's population boom is really two stories. In the north, led by just two states, the population is still rising. In the richer south, numbers are stabilising and in some areas declining. The deepening divisions between these regions mean the government must eventually grapple with a unique problem: the consequences of a baby boom and an ageing population, all inside one nation.