The provided document is an assignment that examines the effect of breastfeeding on childhood obesity. It includes a list of references from academic articles and books, as well as a discussion on how to properly cite sources in APA style. The student is expected to analyze data from the KiGGS study using propensity score analysis and discuss the results. Additionally, they need to write a research paper that compares the duration of breastfeeding and its impact on childhood obesity, utilizing SPSS software for data analysis.