Subsequently, the list of topics was sent to an external multidisciplinary committee of experts (EEC) (n = 16) together with a questionnaire where the experts could indicate if they agreed with the inclusion of information on the topic within the website and where they could mark the level of importance of every topic. Furthermore, the experts provided relevant information. Sixteen external experts were involved in the selection of topics: six general practitioners with expertise in preconception care, four gynaecologists (two academic and two non-academic), three midwives with expertise in preconception care, one pharmacologist, one nutritional expert, and one staff member of the most important Flemish public service for the well-being of children.