Today's children grow up in a society where technologies such as touch screens, touchpads and cell phones are everywhere and have become part of our everyday life. This results in an increased use of Apps designed for these units and there is thus an interesting aspect from a development perspective, and how to go about the best way to create apps intended for children. The purpose of this study is to investigate the general design principles that application developers can use when developing apps for the child as an end user and in addition examine how these apps appeal to and facilitate the child's operation and interaction. This has led us to our question: How do the developers relate to general design principles when creating apps meant for children? With this question in mind we examined relevant research in order to get a set of general design principles regarding app development and find the most important aspects what when creating apps for kids. To answer this question, we conducted a qualitative interview study with professional app developers to seek their views on general design principles. The findings of our study suggest that the developers we interviewed are favorable to the selected general design principles, but it's not that they follow them as a template or guide for how to design for children. Moreover, the interviews has brought new light regarding other aspects when developing apps for children.