[A survey on sex ratio at birth in Beijing city].
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D001208:Asia; D002681:China; D003710:Demography; D003906:Developing Countries; D016656:Family Planning Policy; D005202:Asia, Eastern; D009679:Nuclear Family; D011153:Population; D011154:Population Characteristics; D011640:Public Policy; D012723:Sex; D017678:Sex Distribution; D012737:Sex Factors; D012744:Sex Ratio; D014505:Urban Population
Antinatalist Policy; Asia; China; Demographic Factors; Developing Countries; Eastern Asia; One Child Policy; Policy; Population; Population Characteristics; Population Policy; Sex Distribution; Sex Factors; Sex Preference; Sex Ratio; Social Policy; Sons; Urban Population