ABSTRACT
BACKGROUND: Vitamin D deficiency may result in adverse long-term health consequences in adulthood if it occurs during fetal development, infancy and childhood. To effectively improve vitamin D status of infants/toddlers, there needs to be knowledge and awareness of vitamin D among parents and health professionals. AIMS: The aim of this study was to investigate parents' and health professionals' knowledge, attitudes and behaviours towards vitamin D and sun exposure over two timepoints. METHODS: The study was an ecological study over two timepoints (Parents 2009 and 2021; Health professionals 2010 and 2019) and used an online questionnaire. RESULTS: The analysis included 9834 parents (2009 n = 8032; 2021 n = 1802) and 283 health professionals (2010 n = 193; 2019 n = 90). Parents and health professionals had good knowledge of vitamin D sources, roles and risk factors for deficiency over two timepoints. There were however some confusions regarding the vitamin D content of breast milk, exclusive breastfeeding as a risk factor for deficiency, and ineffectiveness of sun exposure through glass windows in relation to vitamin D synthesis. In 2019, only 37% of health professionals indicated giving advice on supplements for infants/toddlers. Most parents and health professionals believed there was not enough information available to parents regarding vitamin D (>90%) and that skin cancer prevention messages make it difficult to get information about vitamin D across (>70%). CONCLUSION: Although parents and health professionals had good knowledge in most areas, knowledge of some specific sources and risk factors for vitamin D deficiency was poor.