A random sampling of children under age five in Sao Paulo, Brazil, 1984/85, disclosed the median duration of breast-feeding to be 3.5 months and the duration of exclusive breast-feeding, 2.0 months. A comparison of these figures with those of a similar survey carried out in the same city in 1973/74 revealed a substantial increase in both the frequency and duration of breast-feeding. The trend was evident in all socioeconomic strata but most marked among women from higher income and educational levels.
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Monteiro et al. (1987) studied this question.
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