Hauck, Chicago Infant Mortality Study:Peidatrics 2003: ... decreased 
risk... as was breastfeeding either ever (OR: 0.2) or currently (OR: 0.2). 
That's 5 times the risk for not breastfeeding.

That's likely where your "5 times" came from. Other studies, although 
similar in size, do not bring as high a difference although the findings 
are still quite significant:

Mitchell,"Risk Factors for SIDS Following the Prevention Campaign in 
New Zealand:Pediatrics 1997:  There was a 31% increased risk of SIDS 
for NOT breastfeeding (after considering modifiable risk factors. Raw 
figure was 67% increased risk.)

McGarvey,"An Eight-Year Study of Risk Factors for SIDS: Bed-Sharing vs. 
Non Bed-Sharing" Arch of DisChild(Ireland)2005: Breastfeeding bed-
sharing infants had half the risk of SIDS of non breastfeeding bed-
sharers. (and that's double risk for not bf)

Vennemann,"Do risk factors differ between explained sudden 
unexpected death in infancy and sudden infant death syndrome?"Arch 
Dis Child. 2007: Not being breast fed in the first 2 weeks of life is a risk 
factor for SIDS (adjusted OR 2.37).

Vennemann,"Modifiable risk factors for SIDS in Germany: results of 
GeSID.VActa Paediatr." 2005: breastfeeding for less than 2 wk 
(aOR=1.71) 

You can find 5 more refs with numbers from double risk to 7.7 times 
risk inside my formula-infant death article here: 
http://www.babyreference.com/InfantDeaths.htm

Best, linda 
author "Baby Matters"

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