The purpose of this study was to determine the prevalence of feeding practices and sucking habits and their effect on dentition in Istanbul children. 173 children, aged 5 yr participated in this study. The previous breast-feeding, bottle-feeding, pacifier sucking, finger sucking habits were examined. Paired Sample Student t test and ANOVA were used for analysis. In the present study, breast-fed children exhibited bottle-feeding for mean 25.3 ± 22.4 months, pacifier sucking for mean 19.1 ± 13.3 months and finger sucking for mean 28.4 ± 16.1 months respectively. Nonbreast-fed children exhibited bottle-feeding for mean 29.4 ± 20.5 months, pacifier sucking for mean 30.1 ± 12.7 months. Nonbreast-fed children did not exhibit finger sucking. Breast-feeding, bottle-feeding, pacifier and finger sucking did not have any effect on dentition (p>0.05).