https://www.naturalchild.org/articles/james_mckenna/biological.html
https://www.llli.org/the-safe-sleep-seven/
https://greatergood.berkeley.edu/article/item/how_cosleeping_can_help_you_and_your_baby
https://www.askdrsears.com/topics/health-concerns/sleep-problems/co-sleeping-yes-no-sometimes/
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