In France, approximately 500 deaths per year are related to sudden infant death syndrome (SIDS). After a 75% reduction of SIDS-related deaths in the 1990s, thanks to large prevention campaigns directing parents to put their infants to sleep on their back, the number of SIDSrelated deaths remains stable. However we estimate that 100 to 200 deaths of infants per year in France could be preventable with a better education to the risk factors of SIDS.In this prospective and descriptive monocentric study, we aimed at evaluating the level of expecting women's knowledge about SIDS. Questionnaires were distributed during a midwife consult. A score about sleeping conditions, environment and protective factors was determined with coefficients attributed according to the relevance to SIDS.Out of 296 questionnaires distributed, 202 were completed and included in the analysis from March, 1 st to September, 21 th 2018. Score were distributed from 2 to 46/50. The average note was 28.6/50. Ways of getting information was principally from media and not health professionals. When the information was delivered by a caregiver, in particular by the paediatrician, we observed a better knowledge of these women. This study shows that it is important for health professionals to take the time to inform future mothers about risk factors of SIDS, especially the population the least informed such as young mothers and from lower socio-economic status, in order to decreases the number of infant's avoidable deaths.