Be sure to avail yourself of the statistics resources in the research guide here, particularly if you seek current information.
International Historical Statistics: Europe, 1750-2005 Reference HA 1107 .M5 2007
Covers population/vital statistics, labor, agriculture, industry, external trade, transport, communication, finance, prices, education, and national accounts statistics for European countries, 1750-2000.
Reports on the international competition of the same name. Has a section of links to online data repositories with representations of data from many countries and historical eras. The List of Data Repositories is accessed from the link part way down the main page called "Digging Into Data Resources." Then scroll down, on the page you are taken to, to the link "View All."
Choose country of interest and find stats on child mortality rates, nutrition, health, education, demographics, protection, disparities, etc. about children all over the world.
Curated collection of statistical information maintained by the University of Michigan. Access to over 500,000 datasets from more than 700 academic institutions and research organizations. More focussed on sociopolitical research compared to the strongly economic focus of ProQuest Statistical Insight (above). Some of the information is freely available. Browse by topic, series, geographic place, investigator, theme.