Through previous studies into children’s internet search practice, we have gained insight into the taught strategies, information behaviour, and common errors children experience while searching. This paper analyses the visual structure of commonly-used internet search engines (ISEs) to explore how the interface and interaction design of ISEs may influence the search practices of children. Common features of ISEs are identified and the effects of query construction techniques on the visual presentation of information are reported. We use our observations to provide guidelines for the design and development of ISEs for children