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- W3023902373 abstract "This chapter reviews the conception and complications of pregnancy. Fertility rates show ethnic differences. It is found that where infant mortality is high, large numbers of children are conceived to ensure sufficient surviving to support their parents as they grow older, although many Third World women would be happy with smaller families. Cultural pressures may also require the delivery of healthy sons; therefore, a sequence of daughters prevents limitation of family size until they have brothers. Such proliferation is counter-productive in many ways, most obviously where a child develops kwashiorkor when taken off breast feeding to make way for the next neonate. It is observed that where life-expectancy is greater, family size tends to be limited but this depends on the methods of contraception used. Breast-feeding is effective only while the serum prolactin is raised and this falls after a few months, particularly as the child is being weaned. There are cultural effects and religious taboos that influence contraception. Truly genetic problems such as the hemoglobinopathies have both geographical and ethnic distributions." @default.
- W3023902373 created "2020-05-13" @default.
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- W3023902373 date "1989-01-01" @default.
- W3023902373 modified "2023-10-14" @default.
- W3023902373 title "Pregnancy" @default.
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- W3023902373 doi "https://doi.org/10.1016/b978-0-7236-0916-2.50016-2" @default.
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