Sometimes it can help to first read an entry from a reference source on your topic. These won't count as a scholarly article for your assignment. However, they can be very useful to to help you understand the overall topic and/or to discover specific subtopics that you may want to research.
The Health and Wellness Resource Center includes medical encyclopedias which provide very useful overviews of medical conditions. The Sage database provides high quality reference articles on human development related topics.