Based on the Demographic and Health Survey of the Comoros of 1996, the analysis of the determinants of child mortality reaches three conclusions. Firstly, differentiated analytical options generate partially convergent results and provide different dimensions of child mortality. Secondly, the study shows that the low standard of living of households in terms of assets is associated with high child mortality. Thirdly, the determinants of infant and infanto-juvenile mortality are relatively comparable. On the one hand, some common factors to both analytical options affect negatively child health: (i) geographical location in rural zones and/or on the islands of Anjouan and Mohéli; (ii) the low standard of living of households in terms of assets; (iii) some community elements, in particular morbidity, the insufficiency of vaccination and the absence of childbirth assisted by qualified persons. On the other hand, characteristics of mothers and births have an impact on infant and infanto-juvenile survival.