This book covers the essential aspects of prevention of childhood statelessness focusing on norms governing the subject through the rights to acquire a nationality and to birth registration, two vital safeguards to prevent statelessness among children. Its unique feature lies in its exposition of the international legal norms focusing on prevention of childhood statelessness and systematic analyses of domestic legal frameworks on nationality and birth registration of the 10 ASEAN Member States. This book is designed for a wide range of readers comprising academics, advocates, students, policy makers, and other stakeholders working on statelessness affecting children, especially in Southeast Asia.