Crying is a newborn's only means of communication. It's the sound your baby was evolutionarily designed to make impossible to ignore — and it works, every time. But when you're standing at 3am unable to comfort a screaming infant, what you actually need is a systematic framework for figuring out what's wrong. This guide gives you exactly that.
Understanding the 7 core reasons babies cry — and knowing which signals distinguish each one — is the most useful tool you'll have in the first months of parenthood. The goal isn't to become fluent in a mystical baby language; it's to check each possible cause systematically, starting with the most likely.
| Reason | What it looks like | What helps |
|---|---|---|
| Hunger | Rooting, hands to mouth, turning head, rhythmic cry that escalates | Feed. Don't wait for hunger cues to escalate to crying |
| Tiredness | Red eyebrows, eye rubbing, jerky movements, fussy cry after 45–60 min awake | Settle for sleep immediately — don't push wake windows |
| Colic / Unexplained | Inconsolable evening crying, back arching, knees pulled up, peaks at 6 weeks | 5 S's: swaddle, side, shush, swing, suck |
| Gas / Discomfort | Squirming, pulling legs up, grimacing, harder abdomen | Bicycle legs, winding positions, gentle tummy massage |
| Temperature / Nappy | Sudden onset, stops when cause removed, wet or soiled nappy | Check and change nappy; check clothing layers |
| Overstimulation | Fussy, turns head away, stiff body, after active periods or busy environments | Dark, quiet room; reduce handling; white noise |
| Illness / Pain | High-pitched, weak, or unusual cry; fever; won't feed; inconsolable despite all soothing | Call provider immediately — do not wait |
Hunger is the single most common reason a newborn cries, and it should be the first thing you check every single time — regardless of when your baby last fed. Newborns have tiny stomachs (roughly the size of a cherry at birth) that empty quickly, particularly when breastfed, as breastmilk digests faster than formula. Babies born at 37 weeks (early term) may show hunger cues differently than those born at 39–40 weeks, as feeding coordination is still maturing.
Crying is actually a late hunger cue. By the time your baby is crying, they've already communicated hunger through earlier, subtler signals you may have missed — especially in the first weeks when you're still learning to read your baby. Early hunger cues include:
Feeding on demand — responding to hunger cues rather than following a strict schedule — is recommended by both the AAP and WHO for the first months. A scheduled approach in the newborn period can lead to underfeeding and supply issues in breastfeeding mothers.
After hunger, tiredness is the second most likely reason your newborn is crying — and it's also the most frequently overlooked by new parents, who often assume a crying baby needs entertainment or stimulation rather than sleep.
A "wake window" is the amount of time a baby can comfortably stay awake between naps before becoming overtired. For newborns (0–6 weeks), the wake window is approximately 45–60 minutes — and this includes all feeding, nappy changing, and interaction time. Many newborns are only comfortably awake for 30–45 minutes before needing to go back to sleep.
Tiredness cues appear well before the wake window closes: red eyebrows or eyelids, eye rubbing, yawning, a glazed look, or becoming still and quiet. Missing these cues leads to overtiredness, which makes settling significantly harder.
A tired baby can usually be settled relatively easily with a consistent routine. An overtired baby has gone past the point where sleep comes easily — cortisol (the stress hormone) has risen, and the baby is now "wired," making settling take much longer and crying more intense. Overtired crying tends to be higher-pitched and less responsive to normal soothing. The baby may seem to fight sleep even while clearly exhausted. If this is happening regularly, the solution is to move nap time earlier rather than later.
Colic is one of the most distressing — and least understood — newborn experiences. It's defined by the classic "rule of threes": crying for 3 or more hours per day, on 3 or more days per week, for 3 or more consecutive weeks, in an otherwise healthy, well-fed baby. It affects an estimated 10–40% of infants worldwide and is equally common across feeding types (breastfed and formula-fed babies experience colic at similar rates).
Colic typically begins around 2–3 weeks of age, peaks sharply at 6 weeks, and resolves by 3–4 months in most babies. The crying tends to be worst in the evening hours (the "witching hour"), and colicky babies often appear to be in pain — arching their backs, pulling their knees to their chests, and being inconsolable despite all attempts at soothing.
Paediatrician Dr Harvey Karp developed the 5 S method based on the concept that newborns experience a "fourth trimester" — a developmental period where conditions mimicking the womb are most soothing. The five elements work synergistically and are most effective when all five are used together:
Gas is often blamed for infant crying, but it's worth separating what's myth from what's real. All babies swallow some air during feeding, and a gassy abdomen can cause discomfort — but gas is less often the primary cause of prolonged crying than parents assume. Most newborns pass gas very efficiently when given the opportunity to do so.
As babies approach the 4–6 week mark, their wake windows begin to extend slightly and their brains become more capable of processing their environment. This is wonderful in many ways, but it also means they can become overwhelmed by too much sensory input more easily than in the sleepy newborn days.
Overstimulation crying often follows a period of activity, social interaction, or a busy environment — a family gathering, shopping, or even a particularly lively play session. Signs include:
The fix is simple: take the baby to a dark, quiet room. Reduce handling, talking, and eye contact. Hold them in a calm, still position. Many overstimulated babies settle within a few minutes when their environment is simplified. White noise can help bridge the transition.
The vast majority of newborn crying is normal and not a medical emergency. However, some crying patterns are warning signs that require immediate attention. Do not wait to see if things improve on their own if any of the following are present.
If you have ruled out all the above and your baby continues to cry inconsolably, a healthcare provider assessment is always appropriate. Never feel embarrassed about seeking help — that's what they're there for.
For very young newborns (under 3 months), prolonged cry-it-out approaches are not recommended. Responding promptly to a newborn's cries builds secure attachment and does not "spoil" a baby — research consistently shows this. As babies approach 4–6 months, some gentle settling strategies that involve brief periods of fussing may be appropriate, but this is different from ignoring a newborn's cries.
Pain cries tend to be higher-pitched, more sudden in onset, and more urgent-sounding than hunger or tiredness cries. The baby may arch their back, pull their legs up, or show facial grimacing with furrowed brows. If you cannot console your baby after 3 hours of crying, or the cry sounds different from their usual cries, contact your healthcare provider.
The 5 S method, developed by Dr Harvey Karp, stands for: Swaddle (snug wrapping), Side or Stomach position (in your arms — never for sleep), Shush (loud white noise close to baby's ear), Swing (gentle rhythmic motion), and Suck (pacifier or finger). These work best when combined simultaneously. The technique is most effective for colicky or overtired babies in the 0–3 month range.
Colic is defined by the rule of threes: crying for 3 or more hours per day, 3 or more days per week, for 3 or more weeks, in an otherwise healthy baby. It typically peaks at around 6 weeks and resolves by 3–4 months. If your baby's crying fits this pattern and they are otherwise gaining weight and feeding well, colic is a likely explanation — though it's always worth discussing with your GP or pediatrician to rule out other causes such as reflux.
Crying in newborns typically peaks at around 6 weeks of age, regardless of birth date (the peak is calculated from due date, not from birth). After 6 weeks, most babies gradually cry less. By 3–4 months, most babies have significantly reduced their crying duration. This pattern is so consistent across cultures and countries that researchers call it the "Period of PURPLE Crying" — an acronym for Peak, Unexpected, Resists soothing, Pain-like face, Long-lasting, and Evening clustering.
BabyBloom helps you track patterns across feeds, naps, and crying episodes — so you can spot what's triggering difficult periods and share data with your health visitor or pediatrician.
Track in the BabyBloom app — free