....was a quite common question!
And indeed, one could wonder if babies, that are snuggled in with Mum or Dad are still breathing properly.
Research (* see links below) shows, that Oxygen levels only "drop" by 1% and has no serious effects on baby's breathing.
However my personal experience is that, with your baby in a sling, wrap or baby carrier, you always feel them breathing. Even a newborn is able to turn her head if the position is not ideal. Especially when in an upright position as in most baby carriers or wrap styles.
In fact my daughter always dug even deeper into me (my boobs ;)) to find the right comfort to sleep. Sometimes I was worried, but she was so happy there and when I put her head slighty to the side she turned it a few seconds later back to the booby position. And she never breathed hard or irregular, no she would sleep and sleep and sleep and sleep (up to 3 hours).
Maybe its a bit like some people like to sleep under their pillows and they don't suffocate either.
In the end I actually was quite relaxed with my daughter sleeping that way during the day, because with the still unknown cause of SIDS or SUDI, new mothers are scared and so was I. That way, my little one so close to me and feeling her breath reassured me that she can't suffer from SIDS while with me. (for the nights I did have a baby monitor with movement pads for her cot, as she slept in her bed from the beginning and I was so worried, I couldn't sleep)
Unless you use one of the bag type slings (link: bag style slings - are dangerous!) your baby is safe and probably the happiest baby on earth in a wrap or carrier.
links to studies:
Minutes of Babywearing today: DH 25, myself 10
