The single most effective step you can take to prevent SIDS is placing your baby on their back for every sleep, including naps. This one change, promoted through the “Back to Sleep” campaign in 1994, caused SIDS rates to drop dramatically. Still, about 1,529 infants died from SIDS in the United States in 2022, and most of those deaths are tied to unsafe sleep environments that parents can control.
Always Back, Always Flat
Every time your baby sleeps, they should be on their back on a firm, flat surface. That means a safety-approved crib or bassinet with a fitted sheet and nothing else. No pillows, no blankets, no bumper pads, no stuffed animals. These soft items increase the risk of suffocation, entrapment, and strangulation. A bare crib looks sparse, but that’s exactly what a safe crib looks like.
If you’re worried about your baby being cold, use a wearable blanket or sleep sack (unweighted) instead of a loose blanket. Swaddling is fine for newborns who aren’t yet rolling, but stop as soon as your baby shows signs of trying to roll over.
Why Weighted Sleep Products Are Dangerous
Weighted swaddles, weighted sleep sacks, and weighted blankets marketed for infants are not safe. The CDC, NIH, and the American Academy of Pediatrics all warn against them. An infant’s rib cage isn’t rigid, so even modest pressure can make it harder for them to breathe and for their heart to beat properly. There’s also evidence that weighted products can lower oxygen levels, potentially harming a developing brain. The U.S. Consumer Product Safety Commission has issued a clear directive: don’t use any weighted blanket or swaddle for your baby.
Share a Room, Not a Bed
Keep your baby’s crib or bassinet in your bedroom for at least the first six months. Room-sharing lets you monitor your baby and respond quickly, and it’s associated with lower SIDS risk. Bed-sharing, on the other hand, is a different situation entirely. Adult mattresses, pillows, and blankets all create suffocation hazards, and a sleeping adult can accidentally roll onto an infant.
Keep the Room Cool and Ventilated
Overheating is one of the most well-established risk factors for SIDS. Thermal stress can disrupt a baby’s breathing drive and their ability to wake themselves up, which are the very mechanisms that fail during SIDS. Overwrapping, room heating, and heavy night sweating have been strongly linked to SIDS, especially after 2 months of age.
Dress your baby in one layer more than you’d wear comfortably. If the room feels warm to you, it’s too warm for a baby bundled in a sleep sack. Research has found that well-ventilated bedrooms and even the use of a fan are associated with decreased SIDS risk. Check the back of your baby’s neck or their chest to gauge temperature. Sweaty or hot skin there means they’re overdressed or the room is too warm.
Breastfeeding Cuts Risk by Half
Breastfeeding reduces the risk of SIDS by approximately 50% at all ages throughout infancy. Exclusive breastfeeding for at least the first month halves the risk. The protection appears to come from multiple factors: breast milk supports immune function, breastfed babies tend to wake more easily, and breastfeeding promotes lighter sleep patterns that may help a baby rouse if their breathing is compromised. Any amount of breastfeeding is protective, but exclusive breastfeeding offers the strongest benefit.
Offer a Pacifier at Sleep Time
Giving your baby a pacifier when you put them down for naps and nighttime sleep is associated with a lower risk of SIDS. You don’t need to reinsert it if it falls out after your baby falls asleep. If you’re breastfeeding, it’s generally fine to introduce a pacifier once nursing is well established, typically around 3 to 4 weeks.
Eliminate Smoke and Alcohol Exposure
Smoking during pregnancy is one of the strongest modifiable risk factors for SIDS. Mothers who continued smoking beyond the first trimester had a five-fold increase in SIDS risk. When prenatal smoking was combined with alcohol use beyond the first trimester, the risk jumped nearly 12-fold. Secondhand smoke after birth also raises risk. No one should smoke in your home, your car, or anywhere near your baby.
Vaccines Protect, They Don’t Cause SIDS
Because babies receive their first round of vaccines between 2 and 4 months old, which also happens to be the peak age range for SIDS, some parents worry about a connection. Multiple large-scale studies and safety reviews have found no link whatsoever between childhood immunizations and SIDS. In fact, SIDS rates declined dramatically in the mid-1990s and then stabilized in the 2000s, during a period when the number of recommended infant vaccines was increasing. Keeping your baby up to date on vaccinations is safe and protects against serious illnesses.
Consumer Monitors Won’t Prevent SIDS
Smart socks, clip-on sensors, and app-connected baby monitors that track heart rate or oxygen levels are widely marketed to anxious parents, but they are not recommended for SIDS prevention. Studies have clearly shown that home cardiorespiratory monitors are not effective at preventing SIDS, regardless of whether a baby has risk factors. These consumer devices aren’t regulated as medical devices, and early evaluations suggest they have very poor accuracy for detecting the problems they claim to catch. They can generate false alarms that increase parental anxiety without providing real safety benefits. A safe sleep environment is far more protective than any wearable gadget.
Tummy Time While Awake
Since your baby will spend so much sleep time on their back, supervised tummy time during waking hours is important. It builds neck and shoulder strength, supports motor development, and helps prevent flat spots on the back of the head. Most babies can start a day or two after birth with two or three short sessions of 3 to 5 minutes each. By around 2 months, aim for 15 to 30 minutes of total tummy time spread throughout the day. Always stay with your baby during tummy time, and stop if they fall asleep.