Objective: 'Verbal autopsy' (VA) is used to ascertain cause of death in countries where vital registration systems are lacking. Current VA methods for neonatal deaths vary widely and suffer from several limitations. We aimed to: (1) review current neonatal VA methods, (2) identify gaps and limitations, (3) illustrate some limitations using VA data and (4) identify new approaches in methodology and analysis.Study Design: Rolling techniques and database search terms were used to identify articles that described neonatal VA administration, validation and cause of death assignment.Result: Current VA interviews include open and close-ended modules and are administered by trained interviewers. Causes of death are determined using physician review and/or computer algorithms for various neonatal causes of death. Challenges include lack of a standardized VA instrument and administration of methods, difficulty in identifying gold standards for validation studies, lack of validated algorithms for causes of death, poor existing algorithms, lack of standardized death classification terminology and the use of hierarchy to assign causes of death. Newer probabilistic methods of analysis such as Bayes Theorem or the Symptom Pattern method may improve accuracy for cause of death estimation and alleviate some of the challenges with traditional physician and algorithmic approaches, although additional research is needed.Conclusion: Given the continued reliance on VA to determine cause of death in settings with inadequate registration systems, it is important to understand the gaps in current VA methods and explore how methods can be improved to accurately reflect neonatal disease burden in the global community. Journal of Perinatology (2009) 29, 187-194; doi:10.1038/jp.2008 published online 25 December 2008 Keywords: verbal autopsy; cause of death; neonatal mortality; algorithms; hierarchy; challenges Background Data on causes of death are important for health sector planning, including assessing programmatic needs, monitoring progress of interventions and reassessing health priorities. However, little is known about causes of death in many developing countries because vital registration systems are lacking. Many deaths occur at home, outside the formal health sector, and few are attended by qualified medical professionals. Verbal autopsy (VA) has been used to assign cause of death in such settings.VA is a post-mortem in-depth interview with the primary caregiver of the deceased. In the case of child deaths, this is usually the mother. Underlying assumptions are that (1) each cause of death investigated has a set of observable symptoms that can be recognized and recalled by the primary caregiver, and (2) the characteristics of one cause of death can be distinguished from those of all others.The majority of the estimated 4 million annual global neonatal deaths occur in developing countries outside of the formal health care system. 1 Previous research on cause of death for children <5 often excluded neonatal cases due to poor rep...