Japan confronts a dilemma in reshaping its health care for children: the lo
w birth rate is reducing the proportion of children in the overall populati
on, while the health issues for children are becoming increasingly complex
and connected to social behavior. The present paper reviews Japan's changin
g demographics and the declining proportion of children in the population s
tructure. This change has important implications for how the government set
s priorities in the health sector. Next, the paper considers how 'problems'
are defined for health policy in society and how the agenda for health ref
orm is determined. Attention is directed to the political dimensions of the
se two processes of problem definition and agenda setting. Two examples of
health reform for children, in other countries, are discussed to show how t
hese two processes have worked in practice. In the next section, the paper
explores new health issues for children in Japan and the challenges to Japa
nese pediatricians in shaping the agenda for health reform.