A country’s level of wealth does not determine its level of child poverty - the wealthiest nation, the USA, consistently has among the worst rates of child poverty in industrialized nations. 
European nations have, over many years, developed family policies to support all families with children. Typically, these initiatives were not introduced as anti-poverty programs; they were universal and well-funded, and prevented poverty among children. Countries like Canada, U.S., and Australia which have targeted benefits to low income families have had much less success in reducing child poverty. Countries with the lowest level of child poverty have the highest rate of social investment.