I know you are exhausted. I know your baby finally fell asleep on your chest and the last thing you want to do is move them. But this is the one thing I will always ask you to do anyway — place them on their back, in their own sleep space, every single time.
Sudden Infant Death Syndrome, or SIDS, is the sudden and unexplained death of an otherwise healthy baby under one year of age. It is the leading cause of death in infants between one month and one year old, and it is most common between two and four months — right in the thick of the newborn haze, when parents are at their most depleted and their most vulnerable.
We do not fully understand why SIDS happens. What we do know is that it is associated with a combination of factors: a vulnerable infant, a critical developmental window, and an outside stressor — often something in the sleep environment. That last part is where we have real power to make a difference.
Why Back Sleeping Matters
Before the American Academy of Pediatrics launched the Back to Sleep campaign in 1994, stomach sleeping was common — even recommended. Since that campaign began, SIDS rates have dropped by more than 50 percent. That is not a coincidence. That is one of the most significant public health wins in pediatric history.
"Since the Back to Sleep campaign began in 1994, SIDS rates have dropped by more than 50 percent. That is not a coincidence. That is one of the most significant public health wins in pediatric history."
When babies sleep on their stomachs, they are more likely to rebreathe exhaled carbon dioxide, which can build up in the soft bedding around their face. They also have less ability to rouse themselves if their oxygen levels drop. Back sleeping keeps the airway clear and gives babies the best chance of waking if something is wrong.
Side sleeping is not safe either. Babies placed on their side can easily roll to their stomach, and they do not yet have the strength or coordination to roll back. Back is the only safe position for every sleep, every time — until your baby can roll both ways independently, which typically happens around four to six months.
The Safe Sleep Environment
Back sleeping is the foundation, but it works best as part of a complete safe sleep setup. The AAP recommends what is sometimes called the ABCs of safe sleep: Alone, on their Back, in a Crib.
Firm, flat surface
Firm, flat surface. Your baby should sleep on a firm, flat mattress in a crib, bassinet, or play yard that meets current safety standards. No inclined sleepers, no bouncers, no swings for unsupervised sleep — even if your baby sleeps better at an angle. The risk is not worth it.
Keep it bare
Keep it bare. The crib should contain only your baby and a fitted sheet. No pillows, no bumpers, no blankets, no stuffed animals, no positioners. Soft objects and loose bedding are associated with a significant number of sleep-related infant deaths. If you are worried about warmth, use a wearable blanket or sleep sack instead.
Room sharing, not bed sharing
Room sharing, not bed sharing. The AAP recommends that babies sleep in the same room as their parents — but on a separate sleep surface — for at least the first six months, ideally the first year. Room sharing reduces the risk of SIDS by as much as 50 percent. Bed sharing, however, increases risk, particularly when a parent has consumed alcohol, is a smoker, or is extremely fatigued.
Keep the room cool
Keep the room cool. Overheating is a known risk factor for SIDS. The ideal room temperature for infant sleep is between 68 and 72 degrees Fahrenheit. Dress your baby in one more layer than you would wear yourself, and check the back of their neck — if it feels sweaty or hot, they are overdressed.
Smoke-free environment
Smoke-free environment. Exposure to cigarette smoke — both prenatal and postnatal — significantly increases SIDS risk. This includes secondhand smoke in the home and thirdhand smoke on clothing and furniture. If anyone in your household smokes, ask them to do so outside and to change their clothes before holding the baby.
Offer a pacifier at sleep time
Offer a pacifier at sleep time. Research consistently shows that pacifier use at sleep time is associated with a reduced risk of SIDS. You do not need to replace it if it falls out during sleep. If you are breastfeeding, wait until nursing is well established — usually around three to four weeks — before introducing one.
A Few Things Worth Addressing
"My baby sleeps better on their stomach."
My baby sleeps better on their stomach. I know. Many babies do — stomach sleeping can feel more secure and may reduce startle reflexes. But better sleep is not safer sleep in this case. The risk reduction from back sleeping outweighs the sleep quality difference, every time.
"My baby can roll now, so I do not need to worry."
My baby can roll now, so I do not need to worry. Once your baby can roll both ways — back to front and front to back — on their own, you do not need to reposition them if they roll during sleep. But you should still place them on their back to start every sleep until at least 12 months.
"We did not do any of this and our older kids were fine."
We did not do any of this and our older kids were fine. Safe sleep guidelines have changed significantly over the past 30 years, and they continue to be updated as research evolves. What was standard practice a generation ago is not what we recommend today. That is not a criticism — it is progress.
Safe sleep is not about being a perfect parent. It is about making one consistent choice, every single time, even when you are tired and it is 3 in the morning and your baby is finally asleep on your chest. Place them on their back. Every time. That one habit is one of the most powerful things you can do for them.
Sam
Certified Sleep Trainer · Certified Newborn Care Specialist · Registered Psychological Associate · PsyD Clinical Psychology (Candidate). Based in San Diego, available nationwide.