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Darcia, five studies have now looked at the risk of bedsharing for younger infants (i.e., looking at the risk for infants in the first few months as a separate group):
http://www.ncbi.nlm.nih.gov/pubmed/14738790 (Carpenter et al)
http://www.ncbi.nlm.nih.gov/pubmed/16027691 (Tappin et al)
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2065975/?tool=pubmed (McGarvey et al)
http://www.ncbi.nlm.nih.gov/pubmed/17714547 (Ruys et al)
http://pediatrics.aappublications.org/content/123/4/1162.full (Vennemann et al)
All five of those found bedsharing to be associated with an increased SIDS risk in babies in this age group.
All of them differentiated actual bedsharing from falling asleep on a sofa or armchair with the baby. Carpenter, Tappin, McGarvey and Ruys all adjusted for parental smoking as a risk factor. Carpenter, Tappin, McGarvey and Vennemann adjusted for the effect of heavy bedding. Carpenter and McGarvey studies adjusted for alcohol consumption. But, even with adjustment for all those risk factors, the increased risk for young babies still showed up in each study.
That, by the way, is just for SIDS, so that's before you take into account any increased risk of smothering deaths. Even the UNICEF document you link to in support of your claims actually includes in the conclusions that the evidence 'overwhelmingly supports' that '[t]he safest place for your baby to sleep is in a cot by your bed.' Darcia, I know this isn't what you want to hear... but there really is fairly conclusive evidence that even low-risk bedsharing with very young babies still carries some risk as compared to putting them in a cot by the bed.
I do appreciate that the risk is a very small one if proper safety precautions are taken, that there are also potential advantages of bedsharing (although I wouldn't go so far as to claim that 'babies' bodies expect it for optimal growth and development'; there's no evidence it makes a blind bit of difference to either), and that that ultimately parents need to weigh up the pros and cons for themselves. A simplistic 'never bedshare' message isn't a good idea; I agree with you on that much. But it's one thing to say that there may be valid reasons for some families to make the decision to bedshare in spite of the slight risk, and quite another to insist, as you do here, that it 'can be done safely no matter the age of the infant'. That's misleading because it suggests that with precautions there won't be any risk to bedsharing, and that just isn't true.
For further details, here's a post I've written in the past on the topic: http://parentingmythsandfacts.com/2011/12/15/the-truth-about-bedsharing-risks-and-why-it-may-not-be-what-you-think/
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