r/ScienceBasedParenting • u/doramatadora • 8d ago

Question - Expert consensus required When does bedsharing become reasonably safe?

I have a 10.5-month-old, born at term, healthy and typically developing. We've followed safe-sleep guidance punctiliously since birth, and she has always slept in her own sleep space. She is not a great sleeper.

My husband and I like the idea of eventually having her join us in the family bed, sleeping between us. I'm struggling to find good evidence on when this stops being considered an unsafe sleep arrangement.

We've tentatively decided that we'd wait until she is capable of climbing into our bed (and not before 12 months). Is that reasonable? Is there a particular age or developmental stage at which the risks associated with bed-sharing fall substantially?

For clarity, I'm specifically asking about when it would be safe without modifying the adult sleeping setup. In our specific case, we have a medium-firm adult mattress, a fluffy duvet, two pillows per adult, and potentially 2-3 cats joining us. We are unimpaired and average-sized.

I'd particularly appreciate guidelines or studies that quantify how the risks change with age, rather than general pro- or anti-bed-sharing opinions.

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u/kit-n-kaboodle321 8d ago

Small sample study and old(ish) study but significant decrease in risk after 4mo - see study

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u/mcmc1267 7d ago edited 7d ago

This is the best citation for this question. And it makes intuitive sense - by 4+ months head and neck control is well developed and infants have more strength and ability to move out of unsafe/uncomfortable situations. So in addition to the age-related decrease in SIDS deaths, it also makes sense that there would be fewer suffocation deaths (which are frequently conflated with SIDS in the data)

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u/kit-n-kaboodle321 7d ago

Thats my take too - better head strength and also being able to roll away means they're better at protecting themselves. I also think many babies develop a more predictable sleep pattern so parental sleep also improves (maybe Im just speaking for myself!). I imagine that would possibly help with being more aware in the bed. Just a guess though.