You've slept ON your kids?

I'm really glad your children survived your parenting, but the fact is that babies have died from sleeping on their stomachs, especially if they're under 4 months. The rate of SIDS went down SIGNIFICANTLY after a campaign was started in the early 90s by the American Academy of Pediatrics to teach parents to always have babies under the age of 1 sleep on their backs & never allow them to sleep on their stomachs. It went down more with other recommendations for changes in the crib & sleep environment, like what is in the crib, & room temperature. Your babies not dying from you allowing them to sleep on their stomachs doesn't mean it's not a cause of SIDS. Just stop & think that through. There have been infants left in hot cars unattended who haven't died, either, but there's plenty who have died too.
The exact cause of SIDS is unknown - neither is the exact cause of a lot of medical conditions - but it is known that vaccines do NOT cause SIDS. That has been studied extensively, around the world, over the course of decades. Vaccines have been shown to DECREASE the risk of SIDS. There are known risk factors for SIDS. Being born premature is a major risk. Low birth weight is another major risk. Twins are usually weigh less than other babies so that could have been a factor in the Turkish twins who died. Brain abnormalities, genetics, birth defects, respiratory infections can cause SIDS. Again, the parents of the twins who died of SIDS did an assessment of their deaths, didn't blame vaccines. A whole team of medical professionals investigated their deaths. Law enforcement did too. It was concluded that their death was caused by SIDS, not vaccines. The only 1 who said it was due to vaccines is an anti-vaxxer who read about them online & exploited their deaths. She's not a medical professional & she makes her $ selling the stuff on her website that panders to anti-vaxxers.