Absolutely they do. In fact, according to the International Journal of Epidemiology, teen pregnancy in America is only a social problem, not a medical problem. Because Americans have access to the latest medical technology, because Americans are generally healthy overall, and because more than 98% of pregnancies in America involve a mother who's over the age of 14. BUT! Other parts of the world don't have those benefits. Most parts of Asia and Oceania, sub-saharan Africa, and Central America have undernourished people, low education level, very little access to quality medical care, and fewer laws against underage intercourse. As a result, those areas see much higher rates of teen pregnancy and infant mortality than the US.