One in five American children lives in a household with income below the poverty line -- $22,050 for a family of four. Not only are the daily lives of poor children difficult, but experts worry that many will suffer lifelong effects from early deprivation. Concern about child poverty has grown especially strong amid a push in Congress for sweeping budget cuts, including reductions in spending on food stamps and other anti-poverty programs. As child poverty continues to rise amid the nation's persistent economic woes and high unemployment, a long-simmering debate over the problem's root causes is heating up. Liberals argue that fewer children would fall into poverty if the government safety net were stronger and more jobs were available for struggling parents. Conservatives, on the other hand, say child poverty largely stems from parental behavior -- particularly a growing tendency to have children out of wedlock.