This portfolio thesis has three parts: a systematic literature review, an empirical paper, and appendices. Part one is a systematic literature review in which the empirical literature relating to interventions to improve psychological wellbeing in teenage mothers is reviewed. A systematic search identified sixteen papers that matched the inclusion and exclusion criteria and methodological quality was assessed. Narrative synthesis was used to analyse the findings and the clinical implications are discussed. Part two is an empirical paper which explores professionals' experiences of resilience in teenage mothers from a positive psychology stance. Inductive thematic analysis was used to analyse interviews conducted with staff working with teenage mothers to explore their experiences of resilience in this population. Part three comprises the appendices of parts one and two. This includes guidelines for publication for both parts and documentation used in the empirical research. A reflective statement regarding the process of the empirical research and an epistemological statement are also included.