For decades, India’s population story was one of relentless growth: the fertility rate above 5 in the 1970s, the billionth baby in 2000, the projections of endless increase. That story has quietly turned. The National Family Health Survey found India’s total fertility rate at 2.0, below the replacement level of 2.1 at which a population stabilises. India is now the world’s most populous country and a below-replacement fertility one, a combination demographers find historically remarkable. This explainer looks at what the data shows, how the states differ, and what below-replacement fertility means for India’s future.

What the data shows

The fertility decline has been broad and fast. From 2.7 in 2005-06 to 2.2 in 2015-16 to 2.0 in 2019-21, the national rate fell below replacement within a decade and a half. The decline spans religions, castes and income groups: Muslim fertility, long higher than the national average, has fallen sharply too, narrowing differentials. Urban fertility is well below replacement; rural fertility is at or near it. Only a handful of states, notably Bihar, Uttar Pradesh, Jharkhand, Madhya Pradesh and Meghalaya, remain above 2.1, and even there the trend is downward. The wanted-fertility rate, the children women say they want, is lower still, suggesting further decline ahead.

Which states fell first, and why

The southern states led the transition: Kerala, Tamil Nadu, Karnataka, Andhra Pradesh and Telangana reached replacement fertility decades ago, driven by female education, later marriage, better healthcare and effective family planning. Kerala’s fertility fell below replacement as early as the 1980s, an achievement demographers attribute to social development rather than coercion. The northern laggards are catching up fast as the same drivers, girls’ schooling, urbanisation, access to contraception, spread. The pattern confirms the classic demographic insight: fertility falls when women gain education and choices, not when states impose targets.

What it means for population growth

Below-replacement fertility does not mean immediate population decline. Population momentum, the large cohorts of young people born during high-fertility years, will keep India’s population growing for decades, likely peaking around mid-century near 170 crore before stabilising. But the age structure is shifting: the share of children is falling, the working-age share is peaking, and the elderly share will rise steadily. India’s demographic dividend, the growth boost from a large working-age population, is now a wasting asset: the window to convert it into prosperity through jobs and education is narrowing.

The policy debates

Falling fertility has triggered contradictory political responses. Some states have debated two-child norms for government jobs and local elections, despite the evidence that coercion is unnecessary, fertility is falling on its own, and ethically fraught. Southern states, which controlled population first, now fear losing parliamentary representation in the coming delimitation, a perverse punishment for demographic success. Meanwhile, the real policy challenges go unaddressed: creating jobs for the bulging working-age cohort, building eldercare for the ageing wave ahead, and ensuring the fertility decline reflects genuine choice, with full access to contraception and reproductive healthcare, rather than constraint.

India’s demographic future

India is entering uncharted territory: a still-growing but ageing population, with stark regional contrasts between young northern states and ageing southern ones. The contrasts will shape everything from labour migration to federal politics. The optimistic reading is that India achieved the demographic transition voluntarily and fast, through development rather than diktat, and now has a generation to prepare for ageing. The pessimistic reading is that the dividend will be squandered without jobs, and the ageing will arrive without safety nets. The data has spoken; policy must now catch up, turning a demographic transition into lasting prosperity for the generations it shapes, before the precious window of the dividend closes for good.

FAQs

What is India’s total fertility rate? 2.0 children per woman (NFHS 2019-21), below the replacement level of 2.1.

Which states are still above replacement? Mainly Bihar, Uttar Pradesh, Jharkhand, Madhya Pradesh and Meghalaya, though all are declining.

Will India’s population start shrinking? Not soon: population momentum means growth continues for decades, likely peaking around mid-century.

India’s fertility story is a quiet triumph of development: women choosing smaller families as education and opportunity expand. The challenge now is to make the smaller, older India of the future prosperous.

Compiled by the Khabar 24h Editorial Desk from publicly available sources.