Colic in Babies: Signs, Causes and What Really Helps

Three in the morning. Your baby has been screaming for two hours straight. You've tried everything — the breast, your arms, rocking, a fresh diaper — and they're still crying, pulling their legs up, red in the face. You're holding them with one arm and searching "colic" with the other, half-convinced you've missed something or done something wrong.

Most likely, you haven't missed anything. Colic isn't an illness and it isn't your fault. Roughly one in five babies goes through this, and — this matters enough to say up front — it ends. Below: what colic actually is, why it happens, which of the long list of "colic remedies" genuinely works, the signs that tell you this isn't colic anymore, and how you survive it yourself.

What colic in newborns actually is

Colic isn't a diagnosis about the gut, even though the name hints at exactly that. It's a description of behaviour: a healthy, well-fed baby who is gaining weight cries for long stretches, inconsolably, for no visible reason, and almost nothing settles them.

The Rome IV criteria: why the "rule of three" is out of date

Colic used to be defined by Wessel's "rule of three": crying for more than 3 hours a day, at least 3 days a week, for 3 weeks. The problem was that nobody sits with a stopwatch for three weeks straight — and a baby who cries "only" 2.5 hours is suffering exactly as much.

Today the Rome IV criteria are used instead (the international classification of functional gastrointestinal disorders). For everyday, non-research practice, it's colic when:

• the baby is under 5 months old both when the symptoms start and when they stop;
• there are recurrent, prolonged periods of crying, fussing or irritability;
• they happen for no obvious reason, and parents can neither prevent them nor stop them;
• and there are no signs of illness: no fever, and the baby grows and gains weight normally.

The three hours a day haven't disappeared — but they survive only as a research criterion, for selecting babies for studies. The point of the change is simple: colic is a diagnosis of exclusion in a healthy baby, not arithmetic on the clock.

Signs of colic in a newborn: what a typical episode looks like

Most parents describe almost the same picture: it's usually towards evening, the crying starts as if someone flipped a switch, and it's loud, high-pitched and tense — different from the "hungry" cry. The baby goes red, clenches their fists, pulls their knees up to their belly, the tummy feels hard, and gas may pass. Comforting helps briefly, or not at all. Then the episode ends just as abruptly, and between episodes you have a perfectly ordinary baby in front of you — one who feeds, sleeps and smiles.

When colic starts and when it will be over

This is probably the most useful information in the article, so it gets its own section.

• Start: around 2 weeks of age (for babies born preterm, counting from the due date).
• Peak: around 6 weeks. This is the worst point. From here it gets easier, not harder.
• End: for most babies it fades out by 3–4 months, often quite suddenly.

Behind this sits something researchers call the crying curve: in all babies, colicky or not, the amount of crying rises from birth, peaks at around 6–8 weeks, and then declines. The difference between a "calm" baby and a "colicky" one isn't that something is wrong with one of them — it's where they sit on that curve.

Colic leaves no lasting effects. It doesn't affect development, intelligence, personality or future health. The only person it genuinely damages is you. There's a separate section on that below, and it matters just as much as everything else here.

Colic causes: the honest answer

The honest answer is that the mechanism hasn't been pinned down. Anyone who tells you they know exactly what causes colic is selling you something — usually drops. There are several plausible candidates, and different ones are probably at work in different babies:

• An immature gut and microbiome. The mix of gut bacteria in colicky babies differs on average; gut motility itself is still "calibrating".
• Gas and swallowed air. Probably more often a consequence of long crying than its cause: the baby screams → swallows air → the tummy distends → they scream harder.
• Transient lactase overload — a temporary lactose load, more common with a large volume of foremilk.
• Cow's milk protein allergy (CMPA) — in a minority of babies. It usually shows up as more than just crying: rash, mucus or blood in the stool, poor weight gain, frequent spit-ups.
• Oversupply and a fast let-down — the baby chokes, gulps air, pulls off the breast and gets angry.
• Tobacco smoke. One of the few factors with a consistent association: babies living around smoke (including when the smoking happens on the landing or "out of the window") get colic more often.
• The normal crying curve — meaning that for some babies this is simply the upper edge of normal, with no pathology at all.

What's not on that list — and never will be

Let's be blunt, because these ideas have been repeated for decades and they aren't true:

Colic isn't caused by a mother being "anxious". The cause and effect run the other way: it's two months of inconsolable crying that leaves a parent exhausted and anxious, not the reverse. A mother's anxiety is a consequence of colic, and blaming her for it makes about as much sense as blaming a wet person for the rain.

There's no such thing as "bad", "empty" or "not fatty enough" milk. The composition of breast milk doesn't spoil because of your mood, your exhaustion or an argument with your partner. If your baby is gaining weight and wetting diapers, your milk is fine.

It isn't because you "hold them too much" and "spoiled" them. You cannot spoil a two-month-old by holding them. Carrying isn't a cause of colic — it's one of the few things that actually works.

If someone has already told you otherwise — a doctor, a mother-in-law, a neighbour — you can simply set it aside. The evidence doesn't support it.

When it isn't colic anymore: red flags

This is the most important section. Colic is a diagnosis for a healthy baby. Which means that anything saying "this baby is unwell" cannot be colic by definition, however similar the crying sounds.

Call your doctor or emergency services urgently if any one of these is present:

• a temperature of 38 °C (100.4 °F) or higher in a baby under 3 months — this is always an emergency, with no "let's wait until morning";
• vomiting, especially projectile, repeated, or green (bile-stained) — green vomit needs immediate help;
• blood in the stool, or stool that looks like redcurrant jelly; dark, tarry stool;
• poor weight gain or weight loss;
• lethargy: the baby is hard to wake, floppy, not responding as usual;
• a weak, moaning cry, or a high-pitched, piercing scream — it sounds different from ordinary crying, and it's frightening;
• refusing to feed for several feeds in a row;
• a bulging or sunken fontanelle;
• laboured or fast breathing, blueness around the mouth, pallor or mottled skin;
• dry diapers for more than 6–8 hours;
• crying that started suddenly in a baby who never cried like this before, and doesn't stop for hours;
• crying that began after a fall or a knock.

A note on stools, because they're a common source of panic: green stool on its own is usually a normal variant in a baby (especially with fast transit or a lot of foremilk), and a little mucus in the stool also happens in healthy babies. What's worrying isn't that — it's the combination: mucus plus blood, poor weight gain, rash, refusing to feed. Colour on its own isn't a diagnosis.

A simple rule for three in the morning: if between the episodes your baby feeds, gains weight, wets diapers and looks fine — it's most likely colic. If they look ill — it isn't colic, call a doctor.

Colic relief: what actually helps

Here's the honest version, split into what's supported, what's debatable and what doesn't work. Up front: there's no silver bullet. Nothing switches colic off. The goal is to reduce it, not cancel it.

Arms, movement, sound — what works best

The most effective thing is you, not a bottle from the pharmacy.

• Carrying and skin-to-skin contact. A sling or a carrier frees up your hands — that literally changes your quality of life in this period.
• Movement. Steady rocking, walking, the stroller. Sharp shaking — never (more on that below).
• White noise. An extractor fan, a hairdryer, rain, static. Volume roughly like a shower, source no closer than a metre from the head, not all night.
• Sucking. The breast, a finger, a pacifier. Once breastfeeding is established, a pacifier doesn't interfere — and it lowers the risk of SIDS.
• The side or tummy-down hold — tummy along your forearm, head towards your elbow. It works for many babies. Only in your arms, only when awake, only supervised. This is a position for comforting, never for sleep.
• Swaddling — helps some babies before they start rolling over (roughly up to 8 weeks). Arms along the body, legs free with room to bend at the hips, thin fabric. A swaddled baby sleeps on their back only.
• Less stimulation. Sometimes the best thing is to dim the lights, turn off the TV and stop "doing something".

Feeding, latch and burping

Some of the crying that looks like colic is actually the mechanics of feeding. Worth checking:

• The latch. A poor latch = lots of air and an angry baby. If feeding hurts, if there are clicking sounds or cracks, it's almost certainly the latch. There's a detailed walkthrough in the article on how to get breastfeeding established in the first days.
• Oversupply. If there's a lot of milk and the baby chokes, laid-back feeding (biological nurturing) helps, as does "one breast per feed" over a block of time. These approaches are best set up with a lactation consultant or a doctor, so your supply doesn't drop.
• Burping. Hold them upright after a feed and take pauses during it. There isn't much evidence that this treats colic, but there's no harm in it.
• If you're formula feeding: check that the teat flow suits your baby and that the bottle is tilted so there's no air in the teat. There's no need to switch formula without a doctor's say-so.

A probiotic for infant colic: the only supplement with real data

Lactobacillus reuteri DSM 17938 is the only probiotic with a decent evidence base in colic. The nuances matter: the effect is best demonstrated in exclusively breastfed babies, it's modest (less crying on average, but not silence), and the study results are inconsistent — some trials found no difference from placebo. In formula-fed babies there's substantially less data.

This isn't essential treatment and it isn't the first thing to reach for. Talk to your pediatrician about whether it's worth trying in your case, and which product specifically: the exact strain matters, "a probiotic" in general doesn't.

Mum's diet: only if allergy is suspected, and only with a doctor

The blanket advice to "cut out cabbage, cucumbers, dairy, grapes, brown bread" has no evidence behind it, and it often leaves an exhausted woman living on buckwheat and turkey — with no benefit to the baby.

It's a different matter if a doctor suspects CMPA (there's a rash, blood or persistent mucus in the stool, poor weight gain). Then a trial of completely removing milk protein for 2–4 weeks is possible, supervised by a doctor, with the food reintroduced afterwards as a check: symptoms come back — the diagnosis is confirmed; they don't — the diet isn't needed. Without that reintroduction check, a six-month "just in case" diet isn't justified.

What doesn't work, or isn't safe

• Simethicone. The most popular "colic remedy" on the shelf — in studies it doesn't beat placebo. It's safe, and if giving it makes you feel calmer, no harm done. But you're paying for a ritual, not an effect.
• Gripe water, "colic water", fennel and herbal teas. No evidence, and real risks: they displace milk from a baby's diet, the contents are often unpredictable, and alcohol, sugar and plant contaminants turn up. Babies under six months don't need water or teas at all.
• Osteopathy, manual therapy, "realigning" the tummy. There's no good evidence of benefit in colic, and manipulation of a baby's neck is a potential risk.
• Gas tubes and "preventive" enemas — regular use irritates the lining and gets in the way of the baby learning to manage on their own.
• Any antispasmodics, painkillers or "sedatives" without a doctor's prescription. Never give a baby a medicine on the advice of a forum.

Speaking of forums: reading other people's colic stories can help for the sense of "I'm not the only one" — but not as a source of treatment. Those 400-message threads about "what worked for us" are really about coinciding with the age of 3–4 months, when colic ends for everyone.

Your own safety is part of treating colic

This is the section not to skip, even if you're sure it doesn't apply to you.

Inconsolable infant crying is the leading trigger for shaken baby syndrome (abusive head trauma). The peak of presentations with these injuries coincides with the peak of the crying curve — around 6–8 weeks. This doesn't happen to "bad" people. It happens to ordinary, loving parents pushed to their limit, in whom something snaps for one second at the end of a fourth hour of screaming. One second is enough: a baby's brain and neck muscles cannot withstand shaking, and the consequences — blindness, seizures, severe disability, death — are irreversible.

So learn this in advance, before that moment arrives:

If you feel you're at your limit — put your baby on their back in the crib, leave the room, close the door and breathe for 10–15 minutes. Let them cry. A crying baby in a safe crib is not in danger — not in any danger at all. A baby in the arms of someone who can't cope anymore is in danger. Walking away isn't giving up; it's the right, responsible, grown-up thing to do. Come back when you can breathe.

And please say the same thing to everyone who is left alone with the baby: your partner, a grandparent, a babysitter. The people who don't expect this kind of crying react to it worst of all.

This isn't an endurance test you're required to pass alone

Asking for help isn't a luxury and it isn't weakness. Agree on shifts: your partner takes the evening episode while you sleep with earplugs in another room for two hours. Let someone take the stroller out while you have a shower. Two hours of unbroken sleep changes your capacity to withstand crying more than any drops ever will.

And keep an eye on yourself. Feeling depleted during colic is normal. But if the sadness, anxiety, guilt or the feeling of "I'm a bad mother" doesn't let go even in the calm hours, if you cry more than your baby does, if thoughts of harming yourself or them appear — that isn't about your character and it isn't weakness, it's a reason to get help. It's worth reading how ordinary exhaustion differs from postpartum depression, and not putting off a conversation with a doctor. Postpartum depression responds well to treatment, and you don't have to wait until things are "bad enough".

Safe sleep — the rule colic doesn't cancel

The positions that help with colic are positions for an awake baby, in your arms, under your supervision. The moment sleep is involved, there's one rule, and it never changes:

• on the back — for every sleep, day and night;
• separately — in their own crib, in the parents' room for the first 6 months;
• on a flat, firm mattress, in an empty crib: no pillows, blankets, bumpers, positioners or toys.

The temptation to leave a finally-sleeping baby tummy-down on your chest is enormous — especially at four in the morning, when it's the only thing that has worked. But an adult falling asleep together with a baby on a sofa or in an armchair is one of the most dangerous situations there is for an infant. If you feel yourself drifting off — move them onto their back in the crib. Even if they wake up. This is the case where the rule matters more than the sleep.

When to see a doctor without urgency, and what they'll check

Not urgently, but do see your pediatrician if: the crying is increasing rather than easing after 6–8 weeks; it continues past 4 months; there's a rash, persistent mucus in the stool, frequent heavy spit-ups, constipation in a newborn (infrequent, hard, painful stools); the baby is gaining poorly; or if you yourself are running out of strength — that's reason enough for a visit, you don't need a separate one.

The doctor will most likely: weigh and measure your baby and look at the trend on the growth charts; examine them all over — including ears, eyes, abdomen, groin and testicles (to rule out an incarcerated hernia, testicular torsion and other painful conditions); check for a hair wound tightly around a finger or toe (a real cause of inconsolable crying, known as hair tourniquet syndrome); ask about feeding and possibly watch a latch; and assess for signs of CMPA and reflux. Tests and ultrasound usually aren't needed for typical colic in a healthy baby — the diagnosis comes from the examination and your account.

If the feeling that "my doctor isn't listening and only talks about drops" doesn't go away — that's a perfectly normal reason to get a second opinion.

Key takeaways

• Colic is about a healthy baby. Under the Rome IV criteria it's prolonged crying for no visible reason in a baby under 5 months who is growing normally and isn't ill. The old "three-hour rule" no longer defines the diagnosis.
• It ends. It starts around 2 weeks, peaks around 6, and for most babies it's gone by 3–4 months. There are no consequences for the baby.
• The cause hasn't been established. But it's definitely not a mother's nerves or "bad milk" — that guilt is false, and you can set it down.
• A fever in a baby under 3 months, green vomit, blood in the stool, lethargy, a weak or piercing cry, refusing to feed, a bulging fontanelle, poor weight gain — these are not colic. These need a doctor, urgently.
• What works: your arms, movement, white noise, sucking, swaddling and a good latch. Simethicone doesn't beat placebo; gripe water and herbal teas are unproven and unsafe; osteopathy has no evidence. L. reuteri DSM 17938 has a modest and inconsistent effect, mainly in breastfed babies; discuss it with your pediatrician.
• If you're at your limit — put your baby on their back in the crib and step out for 10–15 minutes. A crying baby in a crib is safe. A baby being shaken is not.
• Sleep is always on the back, separately, in an empty crib, however convenient the comforting positions may seem.

And one more thing, for three in the morning. The fact that you can't stop this crying doesn't mean you're a bad parent. Colic is the one situation in parenting where "doing everything right" and "getting a result" aren't connected. You hold, you rock, you carry — and the baby cries anyway, and that is not your failure. You're already doing the main thing: you're there. In a few weeks they'll stop — and you won't even notice which day it was.

This material is general information and does not replace a personal consultation with a doctor. If you have any concerns about your baby's condition, contact your pediatrician, and seek emergency care if red-flag signs appear.