“…Despite this attention, there is an important research gap in documenting and explaining trends in rural-urban or intra-urban differentials in infant and child mortality in less developed countries. Although there are studies that have described these trends (e.g., Carvalho and Wood, 1978;Sawyer, Fernández-Castilla, and Monte-Mor, 1987;Wood and Carvalho, 1988), there are few that have sought to explain them. Thus, little is known about both how and why rural-urban or intra-urban differentials have changed over a period in which the development processes unfolded and levels of urbanization rose, women's educational attainment improved, infrastructure spread, and income and wealth increased.…”