His death was attributed to Sudden Infant Death Sydrome, associated with sleeping in the same bed as his mother.
It found evidence for a strong link between breastfeeding and lower risk of obesity, diabetes, childhood leukaemia and sudden infant death syndrome.
The researchers studied the brains of 27 children, of which 19 died from Sudden Infant Death Syndrome (SIDS), and eight from other conditions.
Research has show that second-hand smoke can increase the risk of a range of conditions, including sudden infant death syndrome and asthma, as well as impairing lung function.
Pathologist Professor Peter Berry, for the prosecution, said in his opinion the two children had been suffocated and were not victims of sudden infant death syndrome or cot death.
These vulnerable groups are disproportionately represented in public housing, they point out, and may be at increased risk for sudden infant death syndrome, asthma, respiratory infections, heart attacks, and cancer.
He pointed out that in Sweden, rates of sudden infant death had - despite a fall in the early 1990s - returned to the same rate as in the 1970s.
Secondhand smoke can increase the risk of respiratory ailments, lung cancer, and heart disease in nonsmokers, and the risk of sudden infant death syndrome and middle ear infections in children.
"There should be nothing in the crib but the baby, " says Rachel Moon, who heads the AAP's task force on Sudden Infant Death Syndrome (SIDS), officially any death of a baby under age 1 that remains unexplained after a thorough investigation.
Dr Rachel Moon, of the Children's Medical Center, in Washington DC, and one of the authors, suggested that children who sleep on the backs at home may be at increased risk of sudden infant death if they are placed on their front during the day.
Dr Paul Goldwater, from the Women and Children's Hospital in North Adelaide, said that a recent rise in cot deaths in the state of Victoria - despite the "back to sleep" advice - raised question marks over its true role in the fall in sudden infant death.
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