I have never come across air embolism (air injected into the bloodstream) as a cause of death in a neonate. I have, however, sadly come across death on many occasions with no definitive cause, and it is put down to prematurity.
Very early in my training I was taught by nurses senior to me the dangers of air embolism, and the importance of zero bubbles in central lines and infusions. So although not everything is seen in practice, the knowledge of risk is there. If you are administering anything into a baby's bloodstream, you surely know of the dangers of air embolism.