Historical analyses of demographic phenomena from the past few decades have provided new insights requiring the reassessment of a number of traditional paradigms, such as the venerable demographic transition theory. Fertility studies have dominated this research, but there is a growing interest in the interrelationships of several demographic variables, such as family formation and infant mortality (Knodel and Hermalin 1984; Nault et al. 1990; Potter 1988a; Working Group on the Health Consequences of Contraceptive Use and Controlled Fertility 1989a, 1989b). This article falls into the latter category; in it we investigate the relationship between childbearing (fertility) and infant mortality in the Utah frontier population during the late nineteenth and early twentieth centuries.