It found evidence for a strong link between breastfeeding and lower risk of obesity, diabetes, childhood leukaemia and sudden infant death syndrome.

BBC: Baby breast feeding

The researchers studied the brains of 27 children, of which 19 died from Sudden Infant Death Syndrome (SIDS), and eight from other conditions.

BBC: Cot death remains a mystery

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.

BBC: Ban smoking in cars, says British Medical Association

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.

BBC: News | UK | Mother jailed for killing her babies

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.

CNN: Should public housing projects go smoke-free?

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.

CNN: Sinus trouble? Secondhand smoke may be to blame

"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.

WSJ: When a Cuddly Crib Puts the Baby in Danger