Most SIDS deaths occur during sleep, typically in the early morning hours, generally between midnight and 9 a.m., with peaks often noted between 2 to 4 months of age and during colder winter months. While they often happen overnight, SIDS can occur during any sleep period, day or night, and is linked to underlying vulnerabilities, developmental stages, and environmental factors like unsafe sleep positions.
Babies who usually sleep on their backs but who are then placed to sleep on their stomachs, such as for a nap, are at very high risk for SIDS. So, it is important for everyone who cares for your baby to use the back-sleep position for all sleep times—for naps and at night.
SIDS can happen anytime a baby is asleep, day or night.
Results Fan use during sleep was associated with a 72% reduction in SIDS risk (adjusted odds ratio [AOR], 0.28; 95% confidence interval [CI], 0.10-0.77). The reduction in SIDS risk seemed more pronounced in adverse sleep environments.
While the cause of SIDS is unknown, many clinicians and researchers believe that SIDS is associated with problems in the ability of the baby to arouse from sleep, to detect low levels of oxygen, or a buildup of carbon dioxide in the blood. When babies sleep face down, they may re-breathe exhaled carbon dioxide.
The peak incidence of SIDS occurs between 1 – 4 months of age; 90% of cases occur before 6 months of age. Babies continue to be at risk for SIDS up to 12 months.
Tummy Time for a Healthy Baby. Babies need tummy time! Although it does not directly reduce the risk of Sudden Infant Death Syndrome (SIDS), tummy time is an important way to help baby grow and develop.
Research shows that room sharing reduces the risk of SIDS and sleep-related infant deaths. It is safer than bed sharing and is safer than having baby sleep in their own room.
White noise may also block out excess stimulation and thus, reduce stress levels in babies. But older claims that white noise can reduce the risk of SIDS [7] need more current research.
Pacifiers may help reduce the risk of SIDS because sucking on a pacifier can bring baby's tongue forward, opening the airway a bit. In other cases, a pacifier doesn't allow a baby to sleep as deeply, reducing the risk the baby stops breathing.
The 30-60-90 nap rule suggests ideal nap lengths are under 30 minutes for alertness, around 90 minutes for a full sleep cycle, while 30-60 minute naps risk grogginess (sleep inertia) from waking during deep sleep, though some find 30-45 minutes helpful for resetting; the goal is to align your nap with sleep stages, avoiding the disruptive middle ground to get energy without feeling worse.
However, it can happen wherever your baby is sleeping, such as when in a pushchair or even in your arms. It can also happen sometimes when your baby isn't sleeping – some babies have died in the middle of a feed.
The 90-minute crib rule is a sleep training technique, often used when toddlers transition to one nap, that extends the standard "crib hour" to 90 minutes: you keep your child in the crib for 90 minutes from the start of the nap, even if they wake early, to encourage longer naps by allowing them time to fall back to sleep in a non-stimulating environment. It helps babies connect sleep cycles, turning short 30-40 minute naps into longer, more restorative ones.
The 2-hour rule for babies means they shouldn't stay in a car seat (or travel system seat) for more than two hours at a time, whether in or out of the car, because the semi-upright position can strain their developing spine and restrict their breathing, increasing the risk of low oxygen levels, especially for newborns and preemies. For long journeys, parents should take breaks every two hours to take the baby out, allow them to lie flat for a while, stretch, and feed, ensuring they get proper head/neck support and circulation.
Prone sleeping significantly associated with SIDS compared to supine position.
A comfortable bedroom temperature helps promote better sleep. A bedroom that is too hot or too cold may affect sleep quality and lead to nighttime awakenings. Whether from a warm bedroom temperature or too many layers of pajamas, overheating can also increase a baby's risk of sudden infant death syndrome (SIDS).
The 5-3-3 rule is a loose guideline for structuring a baby's sleep schedule: 5 hours of wake time before the first nap, 3 hours of wake time before the second nap, and 3 hours before bedtime.
The hardest week with a newborn is often considered the first six weeks, especially weeks 2-3, due to extreme sleep deprivation, constant feeding demands, learning baby's cues, postpartum recovery, and a peak in inconsolable crying (the "witching hour"), making parents feel overwhelmed as they adjust to a new, exhausting routine. While the first week is tough, the challenges often intensify as the baby becomes more alert but still fussy, with major developmental hurdles like cluster feeding and increased fussiness peaking around 6-8 weeks.
Why Does SIDS Peak at 2-4 Months? The widely accepted explanation for the SIDS peak has to do with the timeline of brain development. “Up to 4 months old, the part of the brain that controls breathing and wakefulness is under a lot of development,” Juliet explains.
Hold your baby until they're in a deeper sleep. Babies start in 'active sleep' (with faster, uneven breathing) and move into a deeper sleep after about 20 minutes. That's a good time to transfer them into their sleeping place. Many babies don't like being put down into a cot.
The Japanese have discovered an ingenious way to put your baby to sleep in exactly 13 minutes. If your baby can't fall asleep, the trick is to hold him in your arms for five minutes while walking and then for another eight minutes.
The truth is that home cardiorespiratory (heart and breathing) monitors (e.g., Owlet) do not reduce the risk of or prevent SIDS.
Don't use soft bedding such as pillows, blankets or soft toys to help your baby sleep. The infant can move into a position among the objects that obstructs its breathing. “Whenever they're so small, they don't have the muscle strength to turn their head back,” Stephens said.
Place babies on their backs to sleep for naps and at night.
It is not safe to place babies on their sides or stomachs to sleep, not even for a nap. The safest sleep position is on the back. Babies who sleep on their backs are at lower risk for SIDS than babies who sleep on their stomachs or sides.