---
title: "Sex Ratio at Birth (SRB): Meaning & UPSC Notes"
description: "Sex Ratio at Birth (SRB) measures male per 100 female live births; the natural 103–107 range exposes sex-selective abortion. Key for UPSC GS1 demography."
url: "https://modeldiplomat.com/learn/glossary/sex-ratio-at-birth"
---

[New](https://modeldiplomat.com/)

#

Model Diplomat Research Team · Last reviewed June 22, 2026

TL;DR

- Sex Ratio at Birth is the number of male live births per 100 female live births in a population over a given period, biologically expected at 103–107.
- What is the biologically normal Sex Ratio at Birth, and why does it favour males?
- How does SRB differ from the Child Sex Ratio used in the Indian Census?
- Which legal instrument regulates sex determination in India?
- Can an improvement in SRB be misleading?

[Civil Service & Diplomatic Exams](https://modeldiplomat.com/learn/civil-services/glossary)Updated June 22, 2026

Sex Ratio at Birth is the number of male live births per 100 female live births in a population over a given period, biologically expected at 103–107.

Go beyond the definition

## Research Sex Ratio at Birth (SRB) like a delegate

Model Diplomat's AI drafts position papers, speeches, and country research with real sources — built for MUN and politics students.

## Research it like a delegate

Research on modeldiplomat.com

## Ask a follow-up about Sex Ratio at Birth (SRB)

Open a cited briefing in Model Diplomat search — timelines, positions, and sources you can use in committee or exam answers.

[Start research on Sex Ratio at Birth (SRB)](https://modeldiplomat.com/search?q=Explain%20Sex%20Ratio%20at%20Birth%20\(SRB\)%20%E2%80%94%20key%20dates%2C%20actors%2C%20positions%2C%20and%20sources)

Example

At Panipat, Haryana, on 22 January 2015, Prime Minister Narendra Modi launched the Beti Bachao Beti Padhao scheme to reverse adverse Sex Ratio at Birth in 100 gender-critical districts identified from Census 2011.

Keep learning

## Go deeper than the definition

[Explore all Civil Service & Diplomatic Exams lessons](https://modeldiplomat.com/learn/civil-services)[Test yourself with a quiz](https://modeldiplomat.com/learn/glossary/quiz/civil-services)

## Take Sex Ratio at Birth (SRB) beyond the glossary

Ask the AI research engine built for diplomacy — get briefings, position papers, and speeches with sources you can cite in committee.