The world’s demographic contours are shifting with a speed that has caught forecasters off guard. In Manila, statisticians have logged a total fertility rate of just 1.7 children per woman in 2025, down from 4.1 three decades ago — a plunge so steep it ranks among the fastest ever recorded for a populous developing nation. India, too, has slipped below the replacement threshold of 2.1, with recent surveys pegging its rate at 1.9. The United Nations has revised its projections accordingly, now expecting the global population to peak around 2080. Behind the numbers lie familiar forces: urbanisation, rising costs, delayed marriage, and wider access to contraception. Yet analysts in Frankfurt point to a less obvious accelerant — the iPhone. German demographers argue that the spread of smartphones has fundamentally altered leisure and courtship, diverting attention from family formation and, in their words, leading to fewer babies.

Viewed from New Delhi, however, the fertility decline presents a paradox. India’s birth rate has fallen to levels seen in ageing European nations, but female labour-force participation remains stubbornly low, challenging the conventional wisdom that women have fewer children because they are pursuing careers. Instead, the National Family Health Survey reveals that one in five Indian women aged 20 to 24 was married before 18, and female sterilisation still accounts for the overwhelming share of contraceptive use. While overall fertility drops, the burden of preventing pregnancy continues to rest almost entirely on women, with male sterilisation and condom use remaining marginal. This disconnect underscores that falling birth rates do not automatically signal expanded reproductive agency.

A parallel and troubling trend is emerging among the young. Argentine health authorities warn that condom use among adolescents has fallen sharply, even as teenage pregnancy rates decline. The result is a rise in sexually transmitted infections, a pattern health officials describe as having “nefastas” — disastrous — consequences. India’s data mirrors this: male condom use has dipped from the previous national survey, and comprehensive sex education remains patchy. The reasons are multiple, from discomfort and reduced perceived risk of pregnancy to the encroachment of digital life on real-world intimacy. The same smartphones that may be delaying parenthood are also, it seems, eroding the habits of safe sexual contact among those who do become sexually active.

Taken together, these trends demand a more nuanced policy response. Falling fertility offers demographic relief in nations long worried about overpopulation, but it also foreshadows rapidly ageing societies and eventual workforce shortages. Meanwhile, the decline in condom use among the young signals a public health gap that cannot be ignored. Reproductive agency — the ability to choose if, when, and how to have children — must be measured not just by birth rates but by the freedom from infection and coercion. As digital life rewires human behaviour and family structures, governments from Buenos Aires to Berlin to Bengaluru will need to craft strategies that protect both the quantity and the quality of reproductive health.