How can we prevent sudden infant death syndrome?

This tragedy affects mainly under 6–8-month-olds, and primarily 2–4-month-olds.  For the first six months, sleep baby on its back, never on its front — and only on its side with an abdominal sleep-wrap, a support pillow or rolled-up cloth nappy to make it impossible for the baby to accidentally roll onto its tummy (though some experts are against side-sleeping, and others warn of flat-head syndrome caused by constant back sleeping).  No co-sleeping with a drunk or stoned parent, or with a parent who smells smoky. Use a firm mattress — no soft mattresses or waterbeds (and preferably a new mattress for each new baby). Avoid everything that enables baby’s neck to curve forward, bringing the chin in towards the chest (such as a pillow). This pushes the tongue into the pharynx and narrows the upper airway. Try to have the spine straight. So, take a sleeping baby out of its car seat as soon as practicable. Use light cotton/woollen air-cell blankets — no heavy blankets, loose covers, pillows, or soft toys near the baby’s head.  Using pacifiers is not unsafe (some research shows they may provide some protection). Keep baby in a smoke-free home. Don’t allow the baby to get too hot. Breastfeeding provides antibody protection against infection, but its benefits protecting against cot death are vague.