Child Sex Ratio (0-6 years)

The Child Sex Ratio (CSR), defined under the Census of India as the number of girls per 1,000 boys in the age cohort 0–6 years, is among the most scrutinised demographic indicators in Indian public policy. Its statutory and administrative basis rests with the Office of the Registrar General and Census Commissioner of India, which has tabulated population by single-year and grouped ages under the Census of India Act, 1948, since the decennial enumeration commenced. The 0–6 cohort was isolated as a distinct analytical category because it removes the confounding effects of sex-differential migration and age-specific adult mortality, thereby producing a cleaner signal of sex selection occurring at or before birth and in early infancy. The CSR is conceptually anchored in the biological expectation that, absent intervention, roughly 952 to 972 girls are born per 1,000 boys, making sustained deviations below this band evidence of human interference rather than natural variation.

The procedural mechanics of CSR computation are straightforward in arithmetic but exacting in enumeration. During the population enumeration phase of the decennial Census—the second phase following Houselisting—field enumerators record every individual's age and sex on the household schedule. The Registrar General then aggregates the count of females aged 0–6 and the count of males aged 0–6, dividing the former by the latter and multiplying by 1,000. The resulting figure is published for the nation, every state and union territory, every district, and down to the tehsil, town and ward level, enabling granular geographic comparison. Because the indicator is bounded to children who could not have migrated independently and whose mortality differentials are comparatively narrow, any value markedly below 950 directs attention to sex-selective abortion, female infanticide, or post-natal neglect of the girl child.

A critical distinction in the underlying data concerns the difference between CSR, drawn from a stock census of living children, and the Sex Ratio at Birth (SRB), a flow measure compiled by the Sample Registration System and Civil Registration System. SRB captures the imbalance at the moment of birth and reacts faster to behavioural change, whereas CSR reflects the cumulative outcome of both prenatal selection and differential survival across the first seven years of life. India's National Family Health Survey, most recently NFHS-5 (2019–21), supplements both instruments with survey-based estimates, and the forthcoming Census—delayed beyond its scheduled 2021 round—will supply the next authoritative CSR figure.

The empirical record is stark. The all-India CSR declined from 945 in the 1991 Census to 927 in 2001 and further to 919 in 2011, its lowest recorded level, despite the overall sex ratio improving to 943 over the same span. Haryana (834) and Punjab (846) recorded the most adverse district-level concentrations, with pockets in Mahendragarh, Jhajjar and Rewari districts falling below 800. In response, the Ministry of Women and Child Development, jointly with the Ministry of Health and Family Welfare and the Ministry of Education, launched Beti Bachao Beti Padhao from Panipat, Haryana, on 22 January 2015, initially targeting 100 gender-critical districts identified by their depressed CSR.

CSR must be carefully separated from the broader overall sex ratio, which counts females per 1,000 males across the entire population. The overall ratio can mask deterioration among children because it incorporates the longevity advantage of adult women, who outlive men in most cohorts. A society can therefore report a rising overall sex ratio while its CSR falls—precisely the divergence India exhibited in 2011. The indicator is also distinct from the maternal mortality ratio and the infant mortality rate, which measure death rather than the gendered composition of survivors; CSR alone isolates the demographic footprint of son preference operating through pre-natal diagnostic technology.

The principal legislative instrument addressing the drivers of an adverse CSR is the Pre-Conception and Pre-Natal Diagnostic Techniques (Prohibition of Sex Selection) Act, originally enacted in 1994 as the PNDT Act and amended in 2003 to its present PCPNDT form, which prohibits the determination and communication of foetal sex and mandates registration of all ultrasonography clinics. Enforcement remains uneven: conviction rates are low, sting operations sporadic, and the diffusion of portable ultrasound equipment has complicated regulation. A documented controversy concerns the so-called "diffusion thesis"—the observation that adverse ratios, once confined to prosperous north-western states, have spread into urban centres and southern districts as prenatal technology became cheaper and fertility declined, intensifying the pressure to ensure a son within fewer births. The prolonged postponement of the next Census has further left policymakers reliant on NFHS and SRS estimates, which suggest a modest recovery in SRB but offer no district-level CSR equivalent.

For the working practitioner—whether a civil services aspirant addressing General Studies Paper I, a desk officer drafting gender-budget submissions, or a researcher modelling future marriage-market imbalances—the CSR is an indispensable diagnostic. It converts a contested social phenomenon into a defensible number, exposes the limits of headline indicators, and disaggregates to the district level where intervention is actually delivered. Practitioners should cite the 2011 figure of 919 with its 1991 and 2001 antecedents, pair it with the PCPNDT enforcement record, and flag the data gap created by the deferred Census when assessing the trajectory of son preference in contemporary India.