Backs and stomachs are 5 of one, half a dozen of another.
SIDS is higher with tummy sleepers
Death by aspiration is higher with back sleepers (spitting up, or vomitting, but unable to turn head = inhaling vomit and suffocating on it)
It's really 5 & 6 because with aspiration we can sometimes save them by suctioning the vomit out IF they don't die while their parents are sleeping.
Yeah.
EVERY generation the medical advice changed. When I was a baby it was tummy only...my mum was a baby it was back sleeping only. When my grandmother was a baby it was tummy sleeping only.
Literally EVERY generation (it's something we studied in schools in my stats for healthcare professionals req), the advice is completely different. Because it's a human problem; cot death.
Although... by the time WE'RE grandmothers... the sudden upsurge in "upright sleeping" (which was common 5 generations ago... the rockabye baby in the tree top comes from this kind of sleeping... babies were placed in swings and tied to tree branches while mothers worked in the farm. In city areas, babies slept mostly in veggie bins - slanted drawers, and when in cradle or crib, babies were placed on their backs ON PILLOWS under the upper half of them, slanting them).... makes me suspect our kids will have slings/nests/car seat like "cribs" that keep infants semireclined (to prevent both aspiration and sids).
Anyhow... the rule of thumb is: Once they can roll over you're 100% good to go in either case, and once they have full control of their head, you're not quite at 100%, but pretty durn close (as far as stats go).
((Do know... SIDS or "cot death" can happen any time in the first year or so. It's a diagnosis of exclusion. Meaning... we don't know why it happens. CO2 posioning often gets put into SIDS, even though it's a separate diagnosis. The number 1 suspected reason for SIDS is a kind of sleep apnea. It happens whether your baby is stomach OR back... but the chance gets lowered when they're on their back. This is in part why I suspect we'll be told something different soon... because more and more autopsies are finding CO2 posioning in deaths that would previously be classified as SIDS... which means the pendulum will probably swing in about 10 years. Don't know which way it will go, though. CoSleeping has also been found to reduce cot death *tremendously* ... the thought is that the mother's breathing pattern helps to pattern the infant's so they don't do the apnea thing. So whether it will go to carseat semi upright, cosleeping, or tummy is anyone's guess.... but in the medical community in SCHOOLS it's really starting to be rehashed again. ESP because so many babies (esp reflux babies) need to be on their stomachs to prevent them from aspirating in the NICU... anyhow. It's a medical controversy. 5 : 6.))
These ages (for being able to roll over and to have full head control) are different for all babies. Some babies don't have head control until 6mo. Others have head control in the first week. (My son was born with full control of his head, and could hold himself steady / focus with his eyes... had half the hospital peeking in on the '6mo newborn'... but he didn't even roll over until MONTHS later than most babies. Babies just don't develop on the same line. That phrase we're all sick of "Every baby is different" is just too apt.