I am currently on holidays which explains my ability to respond 
quickly but also my lack of ability to send the references this week. 
However here are a few quick points
.
-  the research is extensive. It is not 1 study but a great many 
replicated world wide.  It originated with a study done in New 
Zealand. The initial study was extensively questioned as the results 
were such a surprise. In the past 15 years several other groups have 
approached the question from a variety of research approaches, all 
have the reached the same conclusion. There are a number of excellent 
studies from Europe and Asia  as well as North America.  This is not 
"questionable" research although like all bodies of research the 
studies themselves vary in quality.
-  back sleeping is the norm for breastfeeding infants co sleeping 
with their mothers. I think one person posted about the difficulty of 
trying to get her co sleeping breastfed child to sleep on his tummy 
during the years that was advised.  Dr McKenna's work clearly explains this.
-  interestingly among the highest risk infants are those who 
normally sleep on their back and grandma or baby sitter puts on their 
tummy. So it is their first time or near to first time on tummy.

I have extensive files at work. If people would like more 
information, they are welcome to email me.

I consider knowledge of this research to be as important in our work 
as knowledge of other well baby issues.  Back to sleep is as proven 
as we can get. There is more research than exists for car seat safety 
which was quickly accepted. PLEASE go out and do the reading.

The really big issue is safe sleep, ie , safe crib environment and/or 
safe adult bed environment.   I totally agree with the comments about 
the pictures in magazines or catalogues of unsafe crib environments.

My children are all in their 20s so were born in the tummy sleeping 
era. I also co slept so they spent most of their time on their back, 
although I also tried to encourage tummy sleeping. The one who 
refused to back sleep at all slept across my chest for most of the 
first year as he was hypertonic  and would arch and cry if set down 
on a firm surface.  Perhaps you were seeing a similar reflex in your 
son Darillyn.

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