Here are some infant mortality numbers from your link:
1947: Finland: 6.5% US: 4.3%
2013 (when the article was written): Finland: 0.3% US: 0.7%
How can the tiny country of Finland be so much better at this than the US? It's because of what they talk about in the article, i.e., a government actually caring for its citizens (read, "welfare state").