[Number of children in families:  present situation and perspectives].
Smolinski
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D001723:Birth Rate; D003710:Demography; D019049:Developed Countries; D005060:Europe; D005061:Europe, Eastern; D005191:Family Characteristics; D005298:Fertility; D008393:Marriage; D011044:Poland; D011153:Population; D011157:Population Dynamics
Demographic Factors; Developed Countries; Eastern Europe; Europe; Family And Household; Family Characteristics; Family Size; Family Size, Completed; Family Size, Ideal; Fertility Measurements; Fertility Surveys; Fertility--changes; Marriage; Marriage Duration; Nuptiality; Poland; Population; Population Dynamics