In families who have experienced sudden infant death, other risk factors can be used to predict the possiblity of subsequent sudden infant deaths.  Here.

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In a series of 20 normal infants, prone sleeping was associated with lower blood pressure which, at 4 weeks and 6 months, had a coincident increased heart rate, a finding not replicated at two to three months - the peak age for sudden infant death.  Here.

In a meta-analysis of data from after the recent decline of sudden infant death, head covering is associated with an odds ratio for sudden infant death of 16.9 [95% CI: 12.6-22.7].  Here. 

Perspective:  Blair and Fleming look at the risks for recurrence of sudden infant death syndrome.  Here. 

In a Swiss population, the increased risk of SIDS in children of mothers with HIV was specifically associated with opiate use by the mother.  Here.

In analysis of data from 67 high risk infants monitored over a total of 3452 days, pulse oximetry was superior to impedence monitoring in detecting true events, although both had very high false positive rates.  Here.

Reviewing 508 sudden infant deaths in Canada, of which 409 were unexplained, 10 unexplained deaths occured while the infant was in a sitting device like a car seat, out of a total of 17 deaths in a sitting device. Here.