Sex-selective abortion is the practice of terminating a pregnancy based upon the predicted sex of the fetus. The selective abortion of female fetuses is most common in areas where cultural norms value male children over female children, especially in parts of People's Republic of China, India, Pakistan, Korea, Taiwan, and the Caucasus. Sex-selective infanticide is killing a child based on the child's sex, usually shortly after birth (sex selective neonaticide).
A 2005 study estimated that over 90 million females were "missing" from the expected population in Afghanistan, Bangladesh, China, India, Pakistan, South Korea and Taiwan alone, and suggested that sex-selective abortion plays a role in this deficit. India's 2011
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Outside the developed world, neither CVS nor amniocentesis account for the bulk of supposed sex-selective abortions, due to their difficulty and high cost. The most common method, instead, is ultrasound. Ultrasound is a simple, non-invasive method that involves scanning the abdomen of the prospective mother with sound waves that create a visual representation of tissues inside her body (including the fetus), and allows the technician who performs it to attempt to locate fetus's genitals - and, therefore, to make a judgment about his or her gender. Unfortunately, ultrasound is nowhere near as accurate as genetic testing: it does not reach near-100% accuracy till as late as the 20th week of pregnancy (however, some novel methods of interpreting ultrasound images exist that allow fairly accurate reading by the 14th week.)
There are also tests which looks for DNA from the fetus in the mother's blood. A meta-analysis published in 2011 found that such tests are reliable more than 98% of the time, as long as they are taken after the seventh week of pregnancy.
 Reasons for sex-selective abortion
 Cultural preference
The selective abortion of female fetuses is most common in areas