Improvements in childsurvival may lead to lower fertility throughseveral pathways. To date, most studies havefocused on the physiological and replacementeffects, whose impacts are known to be modestin size. Few have examined the potentially moreimportant insurance effect on fertility withinunion, and almost none have considered thepossible relationship between child mortalityand marriage, which could also grow out of aninsurance strategy. In this study, we use datafrom 21 sub-Saharan African countries to assessthe relationship between child mortality andyoung women's ages at first marriage andchildbirth. The results show that lower levelsof mortality are strongly associated with latermarriages and first births, even aftercontrolling for the effects of a large numberof other variables. The implications of thefindings are discussed and alternativeexplanations for this relationship arepresented.