Local governments and health services can use this information to work towards reducing health inequalities by focusing on causes as well as results. Mapping urban indicators of child health and well-being reveals that a keen focus on disparities should not be limited to developing countries, as children's rights and development prospects are uneven in some of the world's most prosperous cities. Space, tenure and cost considerations limit the construction of individual latrines in slums. Public facilities are frequently overcrowded, poorly maintained and contaminated. Special provision for children is rare, so those waiting to use communal toilets are often pushed aside at peak times.