Objectives (background): Requirement for Vitamin D is high at particular stages of the lifecycle especially during pregnancy and infancy. Severe vitamin D deficiency during pregnancy may increase the risk of rickets in childhood. While policies exist in Ireland regarding supplementation of Vitamin D in either pregnancy or infancy, no policy recommendation exists in Saudi Arabia. The main aim of this study was to identify attitudes towards Vitamin D supplementation as well as its prevalence in pregnancy and infancy among Muslim mothers living in Ireland and in Saudi Arabia. Methods: A quantitative cross-sectional survey consisting of 121 Muslim mothers living in Saudi Arabia and 77 Muslim women living in Ireland. Recruitment of mothers took place in three hospitals in Makkah (Saudi

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