The United States has the most intensive programme with 26 vaccines that a child is supposed to have in its first year - and it also has the worst mortality level, with six out of every thousand infants dying.
Conversely, Sweden and Japan administer the fewest vaccines - there are just 12 in their programmes - and they have the lowest death rates with just 3 deaths per 1000.
Researchers Neil Miller and Gary Goldman also suspect that sudden infant death syndrome (SIDS) could also be the result of over-vaccination.
The researchers researched the vaccine programmes and infant mortality rates of 34 developed countries.
The UK, which has 19 vaccines in its programme, came 25th with 4.85 deaths per thousand.
(Source: Human and Experimental Toxicology, 2011; doi: 10.1177/0960327111407644).