Dr Carmel Harrington: It's going to be a minimum of three years before we can test for this - Heather du Plessis-Allan Drive

It's every parent's worst nightmare – sudden infant death syndrome.  
Now a breakthrough study out of Sydney suggests there is a genetic marker that makes some kids more at risk to SIDS than others.  
Lead researcher Dr Carmel Harrington from the Children's Hospital Westmead joined Heather du Plessis-Allan. 
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