Fertility Transition in South Asia: Examining Trends in India, Pakistan, and Bangladesh

South Asia is home to nearly a quarter of humanity, yet the way its countries have managed their fertility journeys could not be more different. India just slipped below the magic number of 2.1 children per woman. Bangladesh, once written off as a demographic disaster, is sitting comfortably near replacement level. Pakistan, however, is still wrestling with a fertility rate that refuses to budge much below 3.5. Three neighbours, three timelines, three very different stories – and together they offer one of the most instructive case studies in modern demography.

What is fertility transition, really? 🔗

Fertility transition refers to the long shift from high birth rates to low ones that almost every society undergoes as it modernises. Demographers measure it through the Total Fertility Rate (TFR) – the average number of children a woman would have over her reproductive life if current age-specific birth rates held steady. A TFR of 2.1 is called the replacement level, because it keeps the population stable in the long run without any migration.

In the early 1960s, South Asia as a whole had a TFR hovering around six children per woman. The United Nations recorded a regional TFR of 6.03 for 1960-65, which dropped to 4.72 by 1985-90. Six decades later, the regional average is close to 2.3 – a transformation that has reshaped labour markets, women’s lives, and political conversations across the subcontinent.

India: A late starter that caught up fast 🔗

India launched the world’s first national family planning programme in 1952, but the early decades saw painfully slow progress. TFR remained above 5 children per woman well into the 1970s. The infamous compulsory sterilisation drive during the 1975-77 Emergency set the programme back by years because it created deep public suspicion about state-led population control.

The real turnaround came after liberalisation in 1991 and the launch of the National Population Policy in 2000, which shifted the focus from sterilisation targets to voluntary, informed choice and reproductive health. The results have been striking. According to the latest National Family Health Survey, India’s TFR has fallen from 2.2 in NFHS-4 (2015-16) to 2.0 in NFHS-5 (2019-21) – officially below the replacement threshold for the first time in history.

The internal divide 🔗

The national average hides a sharp north-south divide. Southern states like Kerala, Tamil Nadu, and Karnataka crossed the replacement threshold in the 1980s and 1990s, driven by high female literacy, lower infant mortality, and a longer history of social reform. Northern states like Bihar and Uttar Pradesh have lagged behind. Bihar still recorded a TFR of 3.0 in NFHS-5, while Sikkim’s TFR was just 1.1 – closer to South Korea than to its Indian neighbours.

Bangladesh: The unlikely success story 🔗

Bangladesh’s fertility decline is the one that demographers love to talk about, and for good reason. When the country gained independence in 1971, it was one of the poorest nations on earth, with a TFR above 6 and a child mortality rate so high that about one in five children died before reaching age five in the late 1970s. Conventional demographic theory said fertility could not decline meaningfully under those conditions. Bangladesh proved that theory wrong.

By 2017, Bangladesh’s TFR had crashed to 2.1 – a drop of more than three children per woman in roughly three decades, achieved while the country was still very poor. How did this happen?

Door-to-door family planning 🔗

The government built a vast cadre of female health workers who delivered contraceptives directly to women’s homes. Because cultural norms restricted women’s movement outside the household, the programme came to them. Contraceptive prevalence rose from around 8 per cent in 1975 to over 61 per cent by 2011. This approach turned a constraint – purdah – into a delivery strategy.

Garments, girls, and microcredit 🔗

Two other forces accelerated the decline. First, the explosion of the ready-made garment industry in the 1980s and 1990s brought millions of young women into paid work, raising the age at marriage and the opportunity cost of staying home with many children. Second, the microcredit movement led by organisations such as Grameen Bank and BRAC created women’s groups that doubled as channels for health education. Recent multilevel analysis suggests that female education, more than any other factor, was the dominant driver of declining fertility desires in Bangladesh.

Pakistan: The transition that stalled 🔗

Pakistan started its fertility transition almost a decade after Bangladesh and has progressed at a much slower pace. The TFR fell from 5.4 in 1990-91 to about 3.6 by 2017 – a respectable reduction in absolute terms, but anaemic compared to its neighbours. The United Nations World Fertility Report 2024 places Pakistan in the group of countries still far from completing the transition, alongside Egypt, Ethiopia, and Nigeria.

Why has Pakistan lagged? 🔗

The reasons are structural and cultural. Pakistan combines a strongly patriarchal kinship system, low female labour force participation, and a family planning programme that has historically been underfunded and politically inconsistent. Researchers Bongaarts and Sathar conclude that Pakistan’s transition is close to stalling in mid-transition, with a high and unchanging desired family size, weak demand for contraception, and poor satisfaction of the demand that does exist.

Son preference plays a particularly stubborn role. Couples often keep having children until they have at least one – preferably two – sons. One detailed analysis found that modern contraceptive use in Pakistan would have been 19 per cent higher in 2012-13 in the absence of son preference. The contraceptive prevalence rate is still only around 34 per cent, less than half of what is seen in Bangladesh.

Government policies and the role of the state 🔗

The contrast between these three countries shows clearly that fertility decline is not a passive by-product of development – active state policy matters enormously. Sri Lanka offers the cleanest example. Long before it became wealthy, the country invested heavily in universal primary education, especially for girls, and in free public healthcare. The result was an early fertility transition: Sri Lanka’s TFR had already fallen from 5.74 in 1950-55 to 2.8 by the late 1980s, decades before its neighbours.

India’s policy story has evolved over the years. The shift from coercive targets to cafeteria-style contraceptive choice after 1996, the conditional cash transfers under the Janani Suraksha Yojana for institutional deliveries, and welfare schemes like Beti Bachao Beti Padhao have all worked together. None of them are population-control programmes in the old sense, but each reduces the incentive to have many children by making fewer, healthier ones a more rational choice.

Cultural factors that shape the curve 🔗

Beyond policy, three social variables explain most of the variation across South Asia.

Female education 🔗

The single strongest predictor of fertility almost anywhere in the world is how long a woman stayed in school. Educated women marry later, have more autonomy in household decisions, and value smaller families. In Bangladesh, women with secondary education already reached replacement-level fertility by the early 2000s, while women with no education still had more than four children on average.

Age at marriage 🔗

Early marriage compresses the reproductive years and is closely tied to higher fertility. In India, the legal minimum age for women is 18, but actual practice varies. The mean age at marriage has risen steadily and now stands at over 22 in most states. Pakistan’s mean age at first marriage rose from 17.9 to 19.2 years between 1990 and 2017 – a real but slow change.

Gender inequality and son preference 🔗

Where women have little say in fertility decisions and where sons are seen as economic and social assets, family sizes stay large. South Asia has some of the most skewed desired-sex ratios in the world. The persistence of son preference in Pakistan, India, and parts of Bangladesh continues to distort sex ratios at birth and slow the final stage of fertility decline.

What comes next for the region? 🔗

India has now joined the club of below-replacement countries, which means its population will eventually stop growing – though, because of demographic momentum, the absolute number will keep rising for another two to three decades before peaking. Bangladesh is on a similar trajectory. The big question mark hangs over Pakistan, where rapid population growth combined with climate stress, water scarcity, and slow human capital investment poses serious development challenges.

The South Asian experience reinforces a lesson that has played out across the world: fertility falls fastest when women gain access to education, paid work, healthcare, and the basic right to decide whether and when to have children. Programmes that respect this autonomy succeed. Programmes that bypass it stall.

What do you think? Do you believe India’s below-replacement fertility is something to celebrate, or are you more worried about the ageing population that will follow? And what lessons from Bangladesh’s grassroots family planning model could realistically be adapted to states in India that still have high fertility?

References

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