This article investigates the correlates of the timing of transition into motherhood among adolescent girls in two informal settlements or slums – Korogocho and Viwandani – in Nairobi city, Kenya. Entry into motherhood is an important marker of the transition to adulthood. Other markers include leaving school, entering the labour force, leaving one’s natal home and getting married. However, adolescent fertility has been viewed as both a social and policy challenge in many countries in sub-Saharan Africa (World Health Organization, 2011; United Nations Children’s Fund, 2012a; National Research
Council & Institute of Medicine, 2005). To effectively address this challenge, there is a need to understand the factors driving adolescent childbearing, especially in resource-poor settings such as informal settlements.