Cuba has an infant-mortality rate of 5.3 deaths per 1,000 live births, which is better that the U.S. rate of 6.4. However, Cuba also has an extremely high abortion rate. The United States has a fairly high abortion rate, with about a quarter of conceptions getting aborted. The Cuban abortion rate is about 3 times the U.S. rate.
No wonder Cuba has such a low rate of infant death - so few its babies get to be infants in the first place.