MONDAY, July 14, 2014 (HealthDay News) -- Risk factors for sudden infant death syndrome (SIDS) appear to change with the age of the infant, researchers say.
They found that younger babies are more likely to die when they're sharing beds, while older babies face a higher risk of sudden death when there are objects in the crib with them, such as pillows and toys.
"This study is the first to show that the risks during sleep may be different for infants of different ages," said lead author Dr. Rachel Moon, associate chief of Children's National Medical Center's division of general pediatrics and community health, in Washington, D.C. "Parents of infants under 4 months of age should be aware that bed-sharing is a huge risk factor."
Parents should also be careful to make sure their infants sleep without objects around them, she said.
"Parents often forget that as the infant gets older and nothing bad has happened," Moon said. "We need to re-emphasize that the sleep environment needs to be clear even as the infant gets older, particularly as the infant becomes more mobile."
Although this study found an association between bed-sharing or having objects in the crib and sudden infant death, the study can't prove that these factors actually caused the deaths of the children.
And, Moon noted it would be impossible to do such a study. "We can never do a randomized, controlled trial -- put some babies on their stomachs for sleep and other babies on their backs for sleep, and see what happens," Moon said. "That would be unethical."
More than 2,000 babies died of sudden infant death syndrome in 2010 in the United States, the latest year for which statistics are available, according to the U.S. National Institutes of Health. Ninety percent of t
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