http://qz.com/443609/in-india-where-sons-are-prized-we-had-a-daughter-and-chose-to-stop-there/
In many parts of India, daughters are considered to be a burden because of the dowries required to marry them off. Parents also tend to view a son as a means of lifelong support, unlike a daughter who becomes a part of her husband’s family after marriage.
The result of these beliefs is that India’s child sex-ratio (below six years) is now the worst in 70 years, with 918 girls per 1000 boys in 2011. If the ratio does not improve, it could lead to a deficit of 23 million women in the age group of 20-49 years by 2040.