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Sex ratio is conventionally expressed as females per 1,000 males. The child sex ratio for ages 0-6 is watched separately because it is unaffected by differential adult mortality and migration, making it the cleaner indicator of sex selection at birth.
Sex ratio
Ratio = Female population / Male population x 1,000
Child sex ratio
Child ratio = Female children 0-6 / Male children 0-6 x 1,000
Indicative estimate only. Fees, entitlements, limits and formulas vary by jurisdiction, statute, policy wording and the facts of the case. This is not legal, tax, insurance or financial advice — confirm with a qualified professional or the relevant authority.
About 950 females per 1,000 males, slightly favouring male births, which evens out later because male mortality is higher at every age.
Because it excludes migration and adult mortality effects, so a low value points to sex-selective practices rather than other demographic forces.