Tummy time is supervised, awake time spent with a baby lying on their stomach, and its primary purpose is to build the neck, back, and shoulder strength that infants need to eventually hold up their heads, roll over, sit, crawl, and walk. Because modern safe-sleep guidelines have babies spending most of their sleep on their backs, prone play during waking hours fills the gap that would otherwise leave those muscle groups under-stimulated. But the benefits extend well beyond muscles: research links tummy time to healthier head shape, stronger gross motor development, and even early cognitive gains in certain populations.
How Prone Play Builds Strength
When a baby lies face-down, gravity works against them in a way it simply does not when they are on their back. Lifting the head off the floor to look around forces the neck extensors and the muscles running along either side of the spine to contract. A study measuring muscle activity in healthy infants found that babies showed their highest erector spinae (back muscle) activity when prone and their lowest neck muscle activity when seated in a car seat, supporting the idea that prone time specifically promotes the kind of spinal muscle engagement other positions do not.1PubMed Central. Positioning and baby devices impact infant spinal muscle activity Over weeks of practice, this engagement leads to stronger head control, which is the gateway skill for nearly every motor milestone that follows.
The prone position also lets infants develop what clinicians describe as a balance between flexion and extension. On their backs, babies naturally curl inward. On their stomachs, they push outward and upward. Both movement patterns are necessary for normal musculoskeletal development, and skipping one side of that equation can leave gaps in coordination. As a baby gets stronger, prone play evolves: first they lift the head briefly, then they push up on forearms, then on extended arms, and eventually they start rocking on hands and knees, which is a precursor to crawling.
What the Research Says About Motor Development
A systematic review published in Pediatrics that pooled findings from multiple studies found that tummy time was positively associated with gross motor development, total developmental scores, and the ability to move while prone, supine, crawling, and rolling.2Pediatrics. Tummy Time and Infant Health Outcomes: A Systematic Review That same review also found a positive association with a lower BMI-z score, suggesting that more active babies may carry less excess weight relative to their length, though the direction of that relationship is hard to untangle (more active babies might simply be more inclined to move in the first place).
Some nuance is worth noting. A separate analysis found that while tummy time clearly benefits infant development, the evidence specifically linking it to improved prone-specific motor skills is stronger than the evidence that it transfers broadly to all motor domains.3PubMed. Another look at “tummy time” for primary plagiocephaly prevention and motor development In plain terms, babies who get more tummy time get better at the things you do on your stomach, like lifting the head and pushing up. Whether that reliably accelerates skills like sitting independently is less clear-cut. Still, the overall direction of the evidence points in a single direction: more prone play, better motor outcomes.
How Much Tummy Time Actually Matters
One of the most useful findings for parents is that there appears to be a dose-response relationship between tummy time and developmental scores, meaning more minutes generally produce better results, up to a point. Research tracking infants at two, four, and six months found that at two months, babies who spent roughly 30 to 44 minutes per day in prone play had higher total developmental scores than those who spent fewer than 15 minutes a day.4PubMed. Characteristics of tummy time and dose-response relationships with development in infants By six months, the benefits scaled further: babies getting one to two hours of daily tummy time, and those getting more than two hours, both scored meaningfully higher on developmental assessments than babies getting fewer than 30 minutes.
That does not mean you need to plop a newborn down for an hour-long session. The standard advice from pediatric organizations is to start with a few minutes at a time, several times a day, and gradually increase as the baby tolerates it. Many newborns manage only a minute or two before they fuss. That is fine. The cumulative total across the day is what matters, and short, frequent sessions add up. By three or four months, most babies can handle longer stretches, and by five or six months, many are happily playing on their stomachs for extended periods because they have enough strength to actually enjoy the view.
Tummy Time and Head Shape
One of the most commonly cited reasons for tummy time is preventing positional plagiocephaly, the flat spot that can develop on the back or side of a baby’s skull from spending too much time lying in one position. Because infant skulls are soft and malleable, prolonged pressure on one area can cause asymmetric flattening. Getting the baby off the back of the head during waking hours reduces that pressure.
The systematic review in Pediatrics found a positive association between tummy time and prevention of brachycephaly, the broad flattening across the back of the skull.2Pediatrics. Tummy Time and Infant Health Outcomes: A Systematic Review However, researchers who looked specifically at whether tummy time prevents asymmetric plagiocephaly found the evidence more limited than the confident public-health messaging might suggest.3PubMed. Another look at “tummy time” for primary plagiocephaly prevention and motor development That does not mean tummy time is useless for head shape; it simply means that other factors, like whether a baby has a strong side preference for turning the head during sleep, may play a larger role in whether plagiocephaly actually develops. Tummy time is one piece of a broader strategy that includes varying head position during sleep and minimizing time in devices that cradle the back of the skull.
Why Back-Sleeping Created the Need for Tummy Time
Tummy time as a deliberate practice is largely a product of the early 1990s, when public health campaigns began urging parents to place infants on their backs to sleep. The campaigns were enormously successful at reducing sudden infant death syndrome, but they had a side effect: babies were suddenly spending far more hours on their backs than previous generations had. Pediatricians began noticing more cases of positional skull flattening and slower acquisition of some motor milestones, particularly those related to prone skills. “Tummy time” emerged as the corrective: keep babies on their backs for sleep, but give them supervised prone play whenever they are awake and alert.
One concern that lingered for years was whether growing up on their backs was fundamentally altering when babies learn to roll. A study that directly compared rolling abilities across generations found that the introduction of the supine sleep position had not altered the timing or sequence of infant rolling abilities.5PubMed. Infant rolling abilities–the same or different 20 years after the back to sleep campaign? Babies still rolled on roughly the same schedule their parents’ generation had. The back-to-sleep era did not break the developmental timeline; it just required a more intentional effort to get prone time in during the day.
Cognitive and Perceptual Benefits
The benefits of tummy time go beyond the purely physical. When a baby is on their stomach, they see the world from a completely different vantage point than they do on their back. Objects are at eye level. Other people’s faces are in front of them rather than hovering above. This shift in perspective encourages visual tracking, reaching, and the kind of exploratory behavior that feeds early cognitive development.
A randomized clinical trial involving preterm infants from low-income settings found that a structured tummy-time program expanded the infants’ opportunities to explore their bodies and environment, which favored the development of both motor and cognitive patterns.6PubMed Central. Cognitive and motor improvement by tummy time practice in preemies from low-income settings: a randomized clinical trial Preterm babies often face developmental delays, so the fact that something as straightforward as supervised prone play made a measurable difference in cognition, not just movement, is a meaningful finding. For full-term infants the cognitive link is less well-studied, but the underlying logic is the same: more active engagement with the environment promotes learning.
The Container Problem
If tummy time is the medicine, the disease it treats is partly an overuse of what pediatric researchers call “containers”: car seats, bouncer chairs, swings, positional pillows, and similar devices that hold a baby in a fixed position. These devices are convenient, and some of them (car seats, obviously) are essential for safety. But research has found that parents report using containers for an average of about five hours a day, and more time in containers overall was associated with poorer fine motor scores. Longer bouts in positional pillows specifically were linked to poorer gross motor development.7Pediatric Physical Therapy. Parent-Reported Container Use Relates to Infants’ Motor Development
The issue is not that any single device is harmful in moderation. It is that when you add up the car seat trip, the swing while you cook dinner, the bouncer while you fold laundry, and the crib for naps and nighttime sleep, the baby may spend almost the entire day in some form of supported, semi-reclined, or supine position. The muscles that tummy time develops simply do not get recruited in those positions. Thinking of tummy time as the counterweight to container time can be a helpful frame: the more time a baby spends in devices, the more deliberate you need to be about getting them on the floor.
Why Babies Hate It (and What Actually Helps)
Many parents try tummy time, watch their baby wail after 30 seconds, and wonder if something is wrong. Nothing is. Tummy time is genuinely hard for a young baby. They lack the neck strength to comfortably hold their head up, their arms may not yet support their weight, and the position is unfamiliar. Crying during early tummy time is normal and does not mean the baby is in pain or that you should stop forever.
Parental fear is a major barrier. A study surveying caregivers found that about a third of respondents said they did not believe it was important to put infants in a prone position while awake, and roughly seven in ten said they were afraid their babies would become breathless when positioned face-down.8PubMed Central. “I Am Afraid of Positioning my Baby in Prone”: Beliefs and Knowledge about Tummy Time Practice That level of anxiety makes sense given how strongly the back-to-sleep message has been communicated. Parents hear “stomach sleeping can be dangerous” and extrapolate it to all prone positions, even supervised ones. The distinction matters: the risk associated with prone sleeping is about an unsupervised infant on a soft surface, not about an alert baby on a firm floor with an adult watching.
So what makes tummy time more tolerable? A study testing different approaches found that a parent-led intervention, where mothers lay chest-to-chest with their infants and used a toy to engage them, led to a reduction in negative vocalizations and an increase in head elevation for most of the babies in the study.9PubMed. Tummy time without the tears: The impact of parent positioning and play The parents also rated this approach as more practical and enjoyable than a therapist-directed version. The takeaway is intuitive: babies tolerate tummy time better when they are interacting with a caregiver rather than lying alone on a mat staring at the carpet. Getting down on the floor with your baby, making eye contact, and offering something interesting to look at transforms the experience from an exercise regimen into social play.
Other strategies that parents find helpful include placing the baby on your chest while you recline (this counts as tummy time and provides the comfort of skin contact), using a rolled towel under the baby’s chest to give a slight boost, and timing sessions for when the baby is alert and fed but not immediately after a full feeding. Trying tummy time when the baby is overtired or hungry is a recipe for frustration on both sides.
When to Start and When to Worry
You can begin tummy time from the first days at home. Newborn sessions are short, sometimes just a minute or two, and chest-to-chest counts. There is no medical reason to delay unless a specific condition makes prone positioning inadvisable, which a pediatrician would flag. The earlier you start, the more familiar the position becomes, and babies who are introduced to tummy time early tend to tolerate it better as they grow.
Some parents worry when their baby is slow to hit the milestones typically associated with tummy time, like lifting the head at one month or pushing up on forearms by three or four months. Mild delays are common and usually resolve with more practice. But if a baby shows persistent head lag, has no interest in lifting the head by the end of the second month, or seems unable to turn the head to both sides, it is worth mentioning to the pediatrician. These can occasionally be signs of torticollis (a tightness in the neck muscles) or other conditions that benefit from early intervention.
Crawling Is Not the Finish Line
Parents sometimes assume that the whole point of tummy time is to get a baby crawling, and that once crawling happens (or if it does not happen at all), tummy time has served its purpose. In reality, not all babies crawl. Some scoot on their bottoms, some commando-crawl on their bellies, and some skip crawling entirely and go straight to pulling up and cruising along furniture. A large prospective study of over 400 infants tracked different locomotor strategies and found no significant relationship between the specific method of locomotion and later psychomotor or language development through age five.10PubMed. Locomotor strategies preceding independent walking: prospective study of neurological and language development in 424 cases
The value of tummy time lies less in whether it produces a textbook crawl and more in the cumulative strengthening, sensory exposure, and environmental exploration it provides along the way. A baby who never crawls but spent plenty of time on the floor building neck and trunk strength still got the developmental benefits. The milestones are markers, not the goal itself.
Tummy Time for Preterm and Special-Needs Infants
Premature babies often face greater developmental hurdles, and tummy time can be particularly beneficial for them, though it sometimes needs to be introduced more carefully. The trial involving preterm infants from low-income settings mentioned earlier found measurable cognitive and motor improvements from a structured prone-play program.6PubMed Central. Cognitive and motor improvement by tummy time practice in preemies from low-income settings: a randomized clinical trial For families without easy access to early-intervention services, supervised tummy time is one of the lowest-cost, most accessible developmental supports available.
Babies with conditions like Down syndrome, cerebral palsy, or congenital heart defects may also benefit from prone play but might need modifications. A physical therapist or occupational therapist can suggest positioning supports, adjusted durations, and techniques that account for low muscle tone or respiratory concerns. The principle remains the same: get the baby into a position that challenges their muscles in a safe, supervised way, and gradually increase the demand as they grow stronger.