- 01The Rule of 3: crying ≥3 hrs/day, ≥3 days/week, for ≥3 weeks, in an otherwise healthy baby
- 02Begins 2–4 weeks, peaks 4–6 weeks, resolves by 3–4 months for most babies
- 03Not caused by parenting, feeding method, or birth order
- 04L. reuteri probiotics have the strongest evidence; simethicone and gripe water do not
- 05If you reach your limit: baby down safely in the cot, leave the room, take 5 minutes
- 06Colic is a diagnosis of exclusion — rule out illness, reflux, and CMPA first
What Is Colic? The Rule of 3 Explained
The clinical diagnosis of colic is based on the Wessel criteria (1954), updated as the Rome IV diagnostic criteria (2016): crying or fussing for ≥3 hours/day, ≥3 days/week, for ≥3 weeks in an otherwise healthy infant under 5 months. In clinical practice, many paediatricians apply the criteria more loosely — if a baby is crying inconsolably and no organic cause can be found, the diagnosis of colic is made [1][2].
What colic is not:
- Not caused by bad parenting or something the parent is doing wrong
- Not a sign of long-term digestive disease
- Not more common in formula-fed vs. breastfed babies (evidence does not support this)
- Not more common in first-born children (prevalent across all birth orders equally)
Prevalence is estimated at 10–40% of infants depending on the population studied [1] — the wide range reflects inconsistent application of the Rule of 3 diagnostic criteria.
Colic Symptoms: What to Look For
Crying characteristics:
High-Pitched, Intense Cry
Qualitatively different from a hunger cry or pain cry.
Inconsolable
Cannot be settled by feeding, nappy change, or holding for the duration of the episode.
Predictable Timing
Most colic peaks in the late afternoon and evening (4–10 PM).
Sudden Onset & Cessation
The episode begins and ends abruptly.
Body language during a colic episode:
Clenched Fists
Hands tightly balled during the episode.
Arched Back
Baby stiffens and arches away from the holder.
Legs Pulled to Abdomen
Then pushed out, alternating.
Hard, Distended Abdomen
Gas trapped in the intestine creates visible bloating.
Face Reddening
Consistent with the effort of prolonged crying.
Cold Feet & Legs
Peripheral circulation diverts during acute distress.
Hunger cry vs. colic cry: a hunger cry is rhythmic, lower-pitched, and settles with feeding. A colic cry is escalating, high-pitched, and does not settle with feeding during the episode.
Colic vs. Silent Reflux vs. Normal Fussiness: How to Tell the Difference
The three most common diagnoses for an inconsolably crying infant are colic, silent gastro-oesophageal reflux (silent GORD/GERD), and normal developmental fussiness — plus cow's milk protein allergy (CMPA), which is less common but more urgent. They require different approaches.
| Feature | Colic | Silent Reflux (GORD) | Normal Fussiness | Cow's Milk Protein Allergy |
|---|---|---|---|---|
| Onset | 2–4 weeks | 2–8 weeks | Birth onward | 2–8 weeks |
| Crying pattern | Inconsolable, high-pitched, evening peaks | During/after feeds; arches away | Settles with comfort, feeding, change | Colicky crying + skin/stool changes |
| Body position | Arched back, legs pulled up | Arches away from feed, prefers upright | Relaxed between cries | Arching + rash or blood/mucus in stool |
| Feeding behaviour | Unaffected or briefly worse | Pulls off feed, frequent spit-up | Normal | Refuses feed; blood/mucus in stool |
| Response to feeding | Not relieved | Partially relieved upright | Reliably relieved | Not reliably relieved |
| Additional signs | Hard abdomen, gas | Spit-up (or silent), sour smell | None | Eczema, hives, mucus nappy |
| Resolves | 3–4 months | With positioning, sometimes medication | As baby matures | With elimination diet/formula change |
| When to see GP | At diagnosis; if worsening | Promptly for assessment | Not required | Promptly |
Silent reflux (GORD without visible vomiting) is the most commonly confused with colic. Key distinguishing factor: silent reflux crying is tightly linked to feeds (during or immediately after); colic crying is not. If the baby is calm between evening episodes and shows no feed-linked distress, colic is more likely.
Cow's milk protein allergy (CMPA) affects 2–7.5% of formula-fed infants and ~0.5% of exclusively breastfed infants [4]. It requires medical assessment — an elimination diet for breastfeeding mothers or a change to extensively hydrolysed formula. Do not self-diagnose CMPA without consulting a GP or paediatric dietitian.
When Does Colic Start, Peak, and End?
Colic typically begins in the first 2 to 4 weeks of life, peaks around 4 to 6 weeks, and resolves in most babies by 3 to 4 months — the end of the "fourth trimester." Some babies continue to show colic-like symptoms until 5 months, but this is less common. Colic almost always resolves on its own without any treatment.
How long does a colic episode last? Individual colic episodes typically last 1 to 3 hours, beginning suddenly and ending as abruptly as they started. During the peak weeks, multiple episodes per day are possible. Between episodes, most colicky babies are calm, feeding well, and gaining weight normally.
Does colic end suddenly or gradually? For most babies, colic fades gradually over 2 to 4 weeks — the episodes shorten and become less intense before disappearing. For some it does end quite abruptly at around the 12–14 week mark.
How to Soothe a Colicky Baby: Techniques That Help
No claims about certainty — colic is resistant to all interventions for many babies, and honesty about this builds trust.
Physical Holds
The Colic Hold (Football Hold)
Hold the baby face-down along your forearm, head at your elbow, legs straddling your wrist. The gentle pressure on the abdomen provides relief from trapped gas. Support the head firmly — works during active episodes when other methods fail.
Upright Hold
Hold the baby vertically, stomach against your chest, head over your shoulder. Reduces gas pressure and acid discomfort — particularly useful if reflux is a co-factor.
Tummy Carry
Carry baby tummy-down across both forearms (one supporting chest, one legs). A slight forward incline with gentle back-patting can help move gas downward.
Sensory Soothing
White Noise
Continuous white noise at ~65 dB — matching the womb environment. Fan noise, rainfall, or a dedicated machine. Most effective introduced before the episode escalates. Never play loudly directly into the ear — keep the machine at crib distance.
Skin-to-Skin Contact
Direct skin contact (baby on bare chest, wrapped in a blanket) activates the parasympathetic nervous system and reduces cortisol in both baby and parent. Particularly effective for fourth-trimester colic.
Swaddling
A firm swaddle recreates the contained feeling of the womb, reducing the startle (Moro) reflex that can trigger or escalate an episode. Arms down, hips loose. Stop once baby shows signs of rolling.
Movement Soothing
Rhythmic Motion
Walking, swaying, a baby swing, or a car ride can interrupt a colic episode by activating the vestibular system. Motion does not fix colic; it can interrupt an acute episode.
Warm Bath / Warm Compress
A warm (not hot) bath can relax abdominal muscles. A warm facecloth on the abdomen — held gently, never left unattended — has a similar effect.
The "I Love You" Tummy Massage
Trace "I" on baby's left side (rib to hip), then an inverted "L," then an inverted "U." 2–3 minutes. Use between episodes, not during — a baby in active distress typically resists abdomen touch.
See the pattern in the screaming — so you know it's getting better.
Log colic episodes in Lunara. The AI tracks duration, frequency, and timing — so you can see the peak behind you and the resolution ahead, even when tonight feels endless.
Start Tracking Free →Feeding and Colic: Bottles, Formula, and Breastfeeding Diet
Bottle Feeding
Feeding Position
Feed at a 45° angle minimum — never flat. A more upright position reduces the air the baby swallows alongside milk. Paced bottle feeding (short pauses every 20–30 seconds, tilting the bottle down briefly) reduces flow rate and air intake.
Anti-Colic Bottles
Vent systems reduce air bubbles in the milk. Evidence is mixed. Low-risk to try: Dr Brown's (internal vent), MAM Anti-Colic, Tommee Tippee Closer to Nature. Try one bottle/teat for 5–7 days before switching.
Teat Flow Rate
A teat that flows too fast creates air-swallowing; too slow causes harder sucking (also creating air). If baby is frequently gulping, pausing, or pulling off the bottle, the flow rate may be too fast.
Burping Technique
Burp mid-feed and after. Over-shoulder with back-patting; face-down across the lap; seated upright with chin supported. Allow 2–3 minutes. If no burp after 3 minutes, continue feeding — some babies simply don't burp easily.
Formula changes: partially hydrolysed formula has some evidence for reducing colic severity in formula-fed infants; extensively hydrolysed formula is required for confirmed CMPA. Do not switch formula without speaking to your paediatrician or health visitor first — switching without clinical indication rarely resolves colic and can mask a genuine diagnosis.
Breastfeeding
Maternal diet: evidence for maternal diet restriction is weak. The only well-studied association is cow's milk protein — some exclusively breastfed babies with CMPA respond to maternal dairy elimination (takes 2 weeks to clear from breast milk), attempted under health visitor or dietitian guidance. Foods sometimes blamed but with limited evidence: caffeine, cruciferous vegetables (broccoli, cabbage), onions, spicy food. Do not restrict your diet broadly without evidence — maternal nutrition matters.
Overfeeding vs. hunger: overfeeding in bottle-fed babies creates excess gas from rapid volume intake (signs: frequent large spit-ups, weight gain above the 97th centile). Underfeeding creates hunger distress that resembles colic. Distinguish by wet nappy count (6+ per day = adequate intake) and weight gain at health visitor checks.
The Witching Hour: Evening Fussiness vs. Colic
The "witching hour" is the period of intense fussiness that typically runs from late afternoon to early evening (4–10 PM) in babies aged 2 to 12 weeks. It is distinct from colic — though the two often overlap.
| Feature | Witching Hour | Colic |
|---|---|---|
| Timing | 4–10 PM, predictable | Also peaks in evening but varies |
| Duration | 1–2 hours | ≥ 3 hours per episode |
| Severity | Fussy, hard to settle | Inconsolable, high-pitched cry |
| Frequency | Almost nightly during peak weeks | ≥ 3 days/week (Rule of 3) |
| Cause | Overstimulation, end-of-day overload | Multifactorial (gut, nervous system) |
| Resolves | 6–8 weeks | 3–4 months |
What helps the witching hour specifically:
- Reduce stimulation from 3 PM onward — dimmer lights, quieter environment
- Move the final afternoon feed slightly earlier to avoid overhunger at onset
- Begin the bedtime routine earlier during peak weeks (6 PM rather than 7 PM)
- Babywearing / skin-to-skin from 4 PM preemptively calms the nervous system
Evidence-Graded Guide to Colic Remedies
Parents google "does simethicone help colic" and get contradictory anecdotes. Here's a reference-backed evidence table.
| Remedy | Evidence | Safety | Verdict |
|---|---|---|---|
| Lactobacillus reuteri (probiotic) | ★★★★☆ Moderate-strong | Safe; no adverse effects in trials | Try |
| Simethicone (gas drops) | ★★☆☆☆ Weak | Safe; passes through gut unabsorbed | Low evidence |
| Partially hydrolysed formula | ★★★☆☆ Moderate | Safe | Try under guidance |
| Gripe water | ★☆☆☆☆ Very weak | Generally safe; watch for alcohol content | Not recommended |
| Maternal dairy elimination | ★★★☆☆ Moderate for CMPA | Safe; needs dietitian monitoring | Try under guidance |
| Herbal teas (fennel, chamomile) | ★★☆☆☆ Weak | Not standardised; use caution | Not recommended |
| Chiropractic / osteopathic manipulation | ★☆☆☆☆ Very weak | Unknown safety in infants | Not recommended |
| Dicycloverine / hyoscine | N/A — withdrawn | Not safe for infants | Do not use |
Lactobacillus reuteri (DSM 17938 strain — check packaging) is currently the most evidence-supported intervention for colic in breastfed infants. Trials show a 50–70% reduction in daily crying time over 3 weeks in responsive infants. It is not effective for all babies, and the evidence is stronger in breastfed than formula-fed infants. Give for a minimum of 3 weeks before assessing response [7][8].
Coping as a Parent: Exhaustion, Burnout, and When to Ask for Help
Colic does not hurt the baby long-term. It can, however, seriously harm the parent. Studies show that parents of infants with colic have significantly higher rates of postpartum depression, anxiety, and relationship strain. If you are struggling, that is a direct result of an acutely difficult situation — not a failure of parenting.
The Safe Put-Down Rule
If you feel that you might do something you regret, place the baby safely on their back in the cot (without pillows, blankets, or toys), walk out of the room, close the door, and take 5 minutes. A baby crying alone for 5 minutes is safe. A parent at the limit of their distress is not.
Signs you need support (beyond normal exhaustion):
- Feeling unable to bond with the baby
- Feeling resentment or anger toward the baby that frightens you
- Crying daily or feeling hopeless beyond the immediate exhaustion
- Intrusive thoughts about harming yourself or the baby
- Relationship is in serious distress
Resources:
- Cry-sis helpline (UK): 08451 228 669 — specifically for parents of excessively crying babies
- Postpartum Support International: 1-800-944-4773 (USA)
- PANDA (Australia): 1300 726 306
- Speak to your GP, health visitor, or midwife — tell them you are not coping
Colic is a statistically significant risk factor for postnatal depression. If you are experiencing depressive symptoms beyond exhaustion, speak to your GP — postpartum depression is treatable and common; you are not alone and you are not failing.
When to Take a Colicky Baby to the Doctor or ER
Colic is a diagnosis of exclusion — other causes of prolonged crying must be ruled out. See your GP or paediatrician promptly if you have not yet had an assessment.
- This is the first time you are experiencing this level of crying — get an assessment before self-managing as colic
- Crying is increasing in severity or duration week-on-week
- Baby is not gaining weight normally or is feeding poorly
- Baby is vomiting frequently or has blood/mucus in stools
- You notice skin changes (rash, hives, eczema) alongside the crying
- Baby seems unwell, lethargic, or has a temperature
- Baby has a fever above 38°C (100.4°F) in the first 3 months of life — always urgent, regardless of colic history
- Crying has been continuous for more than 3 hours without any pause or settlement
- Baby has turned blue, pale, or is struggling to breathe
- You notice a bulge in the groin or abdomen that appears when the baby cries (may indicate an inguinal hernia)
- Baby is inconsolable and has not fed in more than 4 hours
- You have any instinct that something is seriously wrong — trust it
Frequently Asked Questions
Colic is defined as crying in an otherwise healthy infant for more than 3 hours per day, more than 3 days per week, for more than 3 weeks — the Rule of 3. It begins in the first 2 to 4 weeks, peaks at 6 weeks, and resolves in most babies by 3 to 4 months. It affects 10 to 40 percent of infants and is not caused by parenting approach or feeding method.
Colic typically begins in the first 2 to 4 weeks. It peaks around 4 to 6 weeks and most babies show improvement by 3 months with full resolution by 4 months. Colic almost always resolves without treatment.
No single cause has been identified. Current evidence points to gut immaturity, an immature nervous system, intestinal gas, and in some cases cow's milk protein sensitivity. Colic is not caused by maternal diet in most cases.
In breastfed babies, the most studied factors are gut and nervous system immaturity, and in a minority cow's milk protein allergy. Evidence for maternal dairy elimination is moderate when CMPA is suspected. Evidence for restricting other foods is weak.
Both are contributing factors. Trapped intestinal gas creates the bloated abdomen and leg-pulling body language. The immature nervous system becomes overstimulated through the day, triggering the evening crying pattern. The cause is multifactorial.
Colic peaks at approximately 4 to 6 weeks of age. After the peak, most families notice gradual improvement over 2 to 4 weeks — episodes become shorter and less intense. Most babies show marked improvement by 3 months and full resolution by 4 months.
Colic can occur at any time but most commonly peaks in the late afternoon and evening (4 to 10 PM). This reflects sensory overstimulation accumulated across the day. Some babies have colic episodes throughout the day.
No — cry-it-out methods are not appropriate for colic. Colic is a physiological phenomenon, not a settling issue. The correct response is active soothing. If exhausted, place baby safely in the cot and take a brief break.
Evidence for maternal dietary restriction is weak. The only change with moderate evidence is eliminating cow's milk protein if CMPA is suspected — it takes 2 weeks to clear from breast milk. Broad restriction of other foods is not well-supported.
Clinical evidence does not support simethicone as effective for colic. Multiple controlled trials show no statistically significant benefit over placebo. It is safe but families should not expect significant results. L. reuteri probiotics have stronger evidence.
Lactobacillus reuteri DSM 17938 has the strongest evidence for colic in breastfed infants — multiple RCTs show 50 to 70 percent reduction in daily crying time over 3 weeks. Evidence is weaker in formula-fed infants. A 3-week trial is reasonable.
See your GP if this is your first assessment or if the baby is not gaining weight. Go to A&E/ER immediately if your baby has a fever above 38°C in the first 3 months, has been crying continuously for over 3 hours, has changed colour, or you have any instinct something is seriously wrong.
Related Articles
References
- Lucassen PL, et al. (2001). Systematic review of occurrence of infantile colic. Arch Dis Child.
- Wessel MA, et al. (1954). Paroxysmal fussing in infancy. Pediatrics.
- Vandenplas Y, et al. (2015). Pediatric gastroesophageal reflux clinical practice guidelines. J Pediatr Gastroenterol Nutr.
- Koletzko S, et al. (2012). Diagnostic approach and management of cow's milk protein allergy. JPGN.
- Metcalf TJ, et al. (1994). Simethicone in the treatment of infant colic. Pediatrics.
- Lucassen PL, et al. (1998). Effectiveness of treatments for infantile colic. BMJ.
- Savino F, et al. (2007). Lactobacillus reuteri versus simethicone in the treatment of infantile colic. Pediatrics.
- Szajewska H, et al. (2013). Lactobacillus reuteri DSM 17938 for the management of infantile colic — Cochrane review. J Pediatr.
- Gupta SK. (2007). Is colic a gastrointestinal disorder? Curr Opin Pediatr.
- Johnson JD, et al. (2015). Infantile colic: recognition and treatment. Am Fam Physician.
- NHS. (2023). Colic. nhs.uk/conditions/colic/
- AAP. (2022). Colic relief tips for parents. HealthyChildren.org.
See the pattern in the screaming — so you know it's getting better.
Log colic episodes in Lunara. The AI tracks duration, frequency, and timing — so you can see the peak behind you and the resolution ahead, even when tonight feels endless.
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