PLoS ONE · 2011 · 30 citations · 11 references
Evidence from the second children clearly shows the sex-ratio is being manipulated by human interventions. More mothers with previous girls tend to use traditional medicines for sex selection, in their subsequent pregnancies. Those taking such medication do not seem to be helped according to expectations. They seem to rely on this method and so are less likely use more definitive methods like sex selective abortions. This is the first such prospective investigation of sex ratio in second children looked at against the sex of previous children. More studies are needed to confirm the findings.
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Causes and Implications of the Recent Increase in the Reported Sex Ratio at Birth in China
Yi Zeng, Ping Tu, Baochang Gu et al. · Population and Development Review · 1993 · 516 citations
Low male-to-female sex ratio of children born in India: national survey of 1·1 million households
Prabhat Jha, Rajesh Kumar, Priya Vasa et al. · The Lancet · 2006 · 398 citations
The many faces of gender inequality
Amartya Sen · The new republic/The New republic · 2001 · 186 citations