India's Population Paradox: Lower Fertility, Yet Adding 13 Million Each Year
India has crossed a major demographic milestone: for the first time in modern history, its total fertility rate (TFR) has slipped below the replacement level. According to the latest Sample Registration System (SRS) report from India’s Office of the Registrar General and Census Commissioner, the average Indian woman is now expected to have 1.9 children — under the 2.1 threshold that keeps a population stable. This puts India among more than 130 countries already at sub‑replacement fertility.
But here’s the twist: lower fertility hasn’t stopped India’s population from growing. In 2026, India is still set to add roughly 1.3 crore people through natural increase — the largest single‑country gain anywhere in the world. That seeming contradiction comes down to a demographic concept called population momentum: decades of higher birth rates have built a huge cohort of young adults now entering their prime childbearing years. Even with smaller families, the sheer number of potential parents keeps births above deaths, delaying the point at which the country's population begins to stabilise and eventually decline.
India's population growth is no longer being driven by high fertility, but by its large and youthful population base. The country has 1.4 billion people, with a large share currently in their 20s and 30s — the prime childbearing years. Births still exceed deaths, resulting in a natural increase of around 1.3 crore people each year against 9.5 million deaths annually. Meanwhile, life expectancy has risen from just 41 years in 1950 to around 72 years in 2024, and infant mortality has declined from 30 deaths per 1,000 live births in 2019 to 24 in 2024. These improvements further contribute to population growth.
Regional differences persist. States like Andhra Pradesh, Tamil Nadu, and Kerala have fertility rates well below replacement, while northern and central states report higher rates. Education is a key driver of lower fertility: women with no formal education have an average of 3.2 children, compared to 1.8 for those with higher education. A study published in Nature titled "Changes in Age at Last Birth and Its Determinants in India" found that Indian women are completing their childbearing at younger ages, with the median age at last birth remaining below 30 years. This reflects a shift towards smaller families and earlier completion of childbearing.
India's birth pattern has changed dramatically over the past decade. First-born children made up 43% of live births in 2014, rising to 66.4% by 2024. Meanwhile, third-and-higher-order births declined from 25.9% to 10.8%, while fourth-or-higher births fell sharply from 10.8% to just 3.5%. Experts project that India's fertility will begin to decline more steeply around 2047 under a steep-decline scenario, or around 2063 under a medium-decline scenario. Some Indian districts are already witnessing population decline.
The big picture: India has entered a new demographic phase. While the fertility rate has fallen below replacement, population momentum ensures continued growth for decades. Understanding this paradox is key to planning for the country's future — in terms of jobs, healthcare, education, and infrastructure.
