Keep Your Baby Safe During Sleep: AAP guidelines explained

Before introducing the recommendations, I feel important to explain you the science behind the recommendations as I believe that if you deeply understand the prerequisites, you are more likely to remember and incorporate them into your daily life.

The researchers use a triple-risk model to explain SIDS. It proposes that SIDS occurs when:

(1) a vulnerable baby (e.g. with premature birth or genetic factors affecting breathing)

(2) at a critical developmental period (e.g. first 6 months when arousal reflexes are immature and neck muscles are weak)

(3) undergoes an external trigger event (e.g. unsafe sleep position or environment).

You can't change the first two factors, but you have complete control over the third. That's where these guidelines come in.

The most important thing you can do is always place your baby on their back to sleep, whether it’s for a nap or at night. This simple step has saved countless lives since the "Back to Sleep" campaign began in the 1990s.

Some parents worry that babies might choke if they spit up while on their backs, but physiologically that’s not the case—their airways are actually designed to protect them in this position. Even babies with reflux should sleep on their backs.

Once your little one starts rolling over on their own (usually around 4-6 months), you don’t have to keep flipping them back—just make sure their sleep space is free of blankets, pillows, and stuffed animals that could block their breathing.

Swaddling is one of the best techniques to have your baby sleep better in the early months. If your baby starts rolling over on their own, use swaddling techniques that leave both arms free. Kids need their arms free to lift their head up from the mattress and put it on the side.

A safe sleep space should be a firm mattress—no sinking or softness. That’s why the AAP recommends a certified crib, or bassinet with a tightly fitted sheet. No fluffy blankets, no cozy bumpers, and no pillows.

In many parts of the world, families don’t use cribs at all. Instead, babies sleep in woven bassinets, firm floor beds, or even right next to their parents on thin, hard mattresses. And in some of these cultures, SIDS rates are actually lower than in the U.S. Why the difference? One big reason is mattress firmness. American adult beds are often extremely soft—think pillow-top mattresses and memory foam. A baby’s face can press into that softness, making it harder to breathe. But in places like Japan, where families traditionally sleep on firm futons, bed-sharing is much more common, yet SIDS is rare.

The AAP strongly encourages room-sharing for at least the first six months, meaning your baby sleeps in your room—but in their own crib or bassinet. Studies show this cuts the risk of SIDS in half.

But let’s be honest—many parents end up bringing their baby into bed at some point, whether for feeding, comfort, or sheer exhaustion. And research actually shows that breastfeeding mothers who bed-share tend to breastfeed longer, which itself reduces SIDS risk. However, keep in mind that a baby can roll or slide down to heavier you and wedging can cause harder breathing and overheating (another factor for SIDS).

So what’s the compromise? Always remember the triple-risk model: remove as many risk factors as possible.

If you think you might fall asleep while feeding your baby, prepare a space following these sale co-sleeping guidelines:

• Move pillows and blankets away
• Make sure the mattress is firm
• Keep the baby on their back

And as soon as you wake up, move them back to their own sleep area.

Breastfeeding is associated with reduced risk of SIDS through several potential mechanisms.

First, breast milk contains antibodies and other immune factors that help protect infants from infections, which are known to be a risk factor for SIDS.

Second, studies also suggest that breastfed infants may be more easily awakened from sleep, potentially allowing them to respond to breathing difficulties or other potentially dangerous situations.

AAP recommends that infants be fed with human milk (i.e., not offered any formula or other nonhuman milk-based supplements) exclusively for ∼6 months, with continuation of human milk feeding for 1 year or longer as mutually desired by parent and infant.

If breastfeeding is not possible or desired, following all other safe sleep rules is highly recommended.

Pacifiers may reduce the risk of SIDS by keeping the tongue forward, potentially preventing airway obstruction, and by potentially preventing babies from sleeping too deeply. We cannot ethically make the controlled randomized research on this topic, so the evidence comes from the case study analysis and can only suggest correlations rather than cause and consequences relationship. However, the research on physiology suggests several potential explanations why introducing a pacifier, especially at bedtime, can mitigate the risk of sleep-related deaths. Some studies suggest that pacifiers may prevent babies from falling into a very deep sleep, making them more likely to arouse if they experience breathing difficulties. Others explain that a pacifier improves autonomic control of breathing, airway patency, or both. Additionally, bulky handle of a pacifier can also prevent breathing obstruction if a baby buries their face in soft bedding.

While the exact mechanisms are still being studied, the current evidence suggests that offering a pacifier during sleep, particularly for babies who are not exclusively breastfed, may help reduce SIDS.

If you breastfeed and do not use a pacifier, it is absolutely OK. For breastfed infants, delay pacifier introduction until breastfeeding is firmly established. This means that you have sufficient milk supply; consistent, comfortable, and effective latch; and your baby gains weight appropriately (as defined by established normative growth curves). The time required to establish breastfeeding is very individual.

If you bottle feed, introducing a pacifier can be a worry-free factor.

If the pacifier falls out after your baby falls asleep, there is no need to put it back.

Do not hang the pacifier around your baby's neck or attach it to clothing while your baby is sleeping.

Overheating is linked to higher risk of SIDS. It is advised not to place hats on infants when indoors except in the first hours of life or in the NICU. The simplest recommendation is to dress the baby in one more layer than you’re wearing. If they’re sweaty or flushed, they’re too warm.

Your baby’s ability neck muscles are developing through time and can be important to mitigate the risk of SIDS: once babies can roll and sleep in prone position, they can easily put their head on a side to breath normally.

AAP recommends to place the infant in tummy time while awake and supervised for short periods of time beginning soon after hospital discharge, increasing incrementally to at least 15–30 min total daily by the age of 7 weeks.

Avoid alcohol, drugs, and smoking during/after pregnancy. Secondhand smoke also increases SIDS risk even if an adult does not smoke in bed. In general, co-sleeping with bed sharing, especially with the infants of 0-4 months old, becomes vulnerable with a current smoker, with an adult under sedating medication or alcohol, and an adult experiencing extreme fatigue due to impaired alertness and ability to arouse if necessary.

There is strong evidence that regular prenatal care reduces the risk of SIDS. Prenatal care providers can counsel future parents on safe sleep practices beforehand and remind you to manage high-risk behaviors such as smoking.

Also, visit your pediatrician for routine checkups: a doctor will keep an eye on your baby's growth and development as well as methods to prevent respiratory infections.

Avoid baby products that advertise to reduce the risk of SIDS. There is no evidence that this is true. If you are unsure about a particular product, check the CPSC (U.S. Consumer Product Safety Commission) website.

Do not use home cardiorespiratory monitors as a means of reducing the risk of SIDS. You can buy devices such as a heart rate monitor and a pulse oximeter but remember that there is no evidence that these devices reduce the risk of SIDS. First, home heart rate monitors do not have to meet the requirements for medical devices, and second, they can give a false sense of security. You can use such a device if you want, but do consider it as a substitute for following all of the above safe sleep rules.

If you've ever sacrificed safety for sleep, you're not alone. The first months are brutally tiring. If you're struggling with sleep routines, we can work together to find solutions that keep your baby safe while helping everyone rest better.

Moon, Carlin, Hand (2022) Sleep-Related Infant Deaths: Updated 2022 Recommendations for Reducing Infant Deaths in the Sleep Environment Free. Pediatrics, 150 (1): e2022057990.

Gillani, Lowell, Quinlan (2021). A firm recommendation: measuring the softness of infant sleep surfaces. Inj Epidemiol, 8 (Suppl 1): 30. DOI: 10.1186/s40621-021-00325-x.

Hauck, Omojokun, Siadaty (2005) Do pacifiers reduce the risk of sudden infant death syndrome? A meta-analysis. Pediatrics,116(5). DOI: 10.1542/peds.2004-2631.

Bach, Libert (2022) Front. Hyperthermia and Heat Stress as Risk Factors for Sudden Infant Death Syndrome: A Narrative Review. Pediatr., 10. DOI: 10.3389/fped.2022.816136.