AIM: To describe the prevalence of snoring in infancy and the factors associated with snoring. METHODS: The investigation comprised a cross-sectional study of 1800 infants. Snoring was ascertained by interviewer-administered questionnaire. RESULTS: The prevalence of snoring was 15.8% in the first 4 wk of life and 26.1% in the past 2 wk. Snoring in the past 2 wk was associated with increasing age of the infant, male gender, maternal smoking, sleep position, number of respiratory infections and snoring in the first 4 wk of life after adjustment for potential confounders. No associations were found with snoring in the first 4 wk of life. CONCLUSION: Snoring is common in infancy. The identified risk factors for snoring are probably causally related to snoring. Further studies are needed to establish whether snoring in infancy is associated with current or subsequent morbidity.