Prolonged duration of finger- and pacifier-sucking may be a risk factor for maldevelopment of orofacial structures and dental occlusion. This study assessed the prevalence of nutritive and non-nutritive sucking habits and their association with some contributing factors among 7-year-old girls in Mashhad, Islamic Republic of Iran. Based on a questionnaire to the parents of 436 schoolgirls, the rate of current or previous pacifier-sucking was 26.6% and of finger-sucking was 10.6%. Child’s birth rank and number of siblings and parents’ educational level were significantly related to ever pacifier-sucking but not to finger-sucking. The highest prevalence of ever pacifier-sucking was among children who had been breast- and bottle-fed but finger-sucking was more common among exclusively breastfed children.