In the 21st century, the majority of problems that scourged humanity for centuries have been pacified by science and medicine. Diseases are being successfully cured; famine does not occur in the majority of developed countries; wars are no longer global. These, as well as other reasons, caused the extensive growth of population all over the world. One of the most overpopulated regions in the world is China, where the amount of people is close to 1.4 billion. In an attempt to avoid problems connected with overpopulation, the Chinese government in 1978 adopted the so-called one-child policy, which restricted each family to have more than one child (nowadays, exceptions are allowed due to reforms). However, although it helped to some extent, this policy also had a number of unforeseen consequences