Colic is intense, unexplained crying that follows a predictable pattern: at least 3 hours a day, on 3 or more days per week, for at least 1 week. About 20% of infants experience it, typically starting in the first few weeks of life and resolving on its own by 3 to 4 months. If your baby is otherwise healthy, feeding well, and gaining weight normally but has long stretches of inconsolable crying, colic is the most likely explanation.
The Pattern That Defines Colic
All babies cry, so the distinction isn’t just about volume or intensity. Colic follows a recognizable pattern known as the “rule of threes”: crying or fussing for 3 or more hours per day, on 3 or more days per week. The original clinical definition required this to persist for 3 weeks, but many pediatricians now use a modified version that looks at just the preceding week to make a faster assessment.
The timing is often the biggest clue. Colic crying tends to cluster in the late afternoon and evening, sometimes called the “witching hour.” Your baby may be perfectly content in the morning and early afternoon, then become almost impossible to soothe starting around 5 or 6 p.m. This predictability, where the crying arrives like clockwork, is one of the clearest signals that you’re dealing with colic rather than random fussiness.
What Colic Looks Like in Your Baby’s Body
Colic crying looks different from hunger or tiredness crying. A colicky baby’s whole body tenses up. You’ll notice clenched fists, stiff arms, and legs pulled tight against the belly or held out rigidly. Many babies arch their backs and tighten their abdominal muscles. Their face often turns red or flushed from the effort of crying. The crying itself tends to be higher-pitched and more intense than usual, and it starts suddenly, sometimes without any obvious trigger.
Between episodes, this is what sets colic apart from something more serious: your baby acts completely normal. They feed well, gain weight on track, and seem comfortable. The crying bouts are intense but self-contained.
How Colic Differs From Reflux and Gas
Parents often wonder whether the problem is actually reflux or trapped gas rather than colic. These can look similar on the surface, but the details are different.
Reflux typically shows up during or right after feeding. A baby with reflux will spit up frequently, cough or choke while eating, arch their back during feeds, and sometimes refuse the bottle or breast. In more significant cases, they may not gain weight as expected. The discomfort is tied to eating, not to a specific time of day.
Gas can certainly make a baby fussy, and colicky babies often do seem gassy, with rumbly stomachs and frequent wind. But isolated gas discomfort is usually shorter-lived and resolves once the baby passes gas or has a bowel movement. It doesn’t follow the same clockwork evening pattern.
Colic, by contrast, involves intense crying with no other abnormal signs. Your baby isn’t vomiting, isn’t refusing feeds, and is growing normally. The crying is the only symptom, and nothing you do seems to explain or fully stop it.
Keeping a Crying Diary
If you’re unsure whether your baby’s crying meets the colic threshold, a simple log can help. For one week, note every time your baby cries or fusses: when it started, when it stopped, and what (if anything) was happening. Some pediatricians specifically ask parents to keep a 24-hour behavior diary to confirm that total crying and fussing exceeds 3 hours in a day. This record also gives your pediatrician something concrete to review, rather than relying on memory during an exhausting stretch of new parenthood.
What Actually Helps During Episodes
No single technique works for every colicky baby, but several approaches are worth trying. Rhythmic, low-frequency sound is one of the most reliably calming options. Hold your baby near a running washing machine, turn on a fan, or use a white noise machine. The steady hum mimics the constant sound environment of the womb.
Motion helps many babies. A car ride, a gentle swing, or simply walking around the house while holding your baby can interrupt the crying cycle. Changing your baby’s position matters too. If they’ve been lying down, try sitting them upright. If they’ve been facing your chest, turn them outward. A gentle back rub with your baby draped face-down along your forearm (sometimes called the colic carry) puts light pressure on the belly that some babies find soothing. A pacifier can also help, since the sucking reflex has a natural calming effect.
One thing that likely won’t help: changing your diet if you’re breastfeeding, or switching formulas. A large prospective study published in JAMA Pediatrics found no relationship between the source of early infant nutrition and colic. In most cases, recommendations to alter a baby’s diet in hopes of fixing colic are unfounded. That said, if your baby has other symptoms beyond crying, like rashes, blood in the stool, or frequent vomiting, a food sensitivity is a separate issue worth discussing with your pediatrician.
Signs That It’s Not Colic
Colic is a diagnosis of exclusion, meaning it’s what’s left when nothing else is wrong. Certain signs suggest the crying has a medical cause that needs attention:
- Fever above 100.4°F: Colic does not cause a fever. Any temperature above this threshold in an infant warrants a call to your pediatrician.
- Projectile vomiting or bright green vomit: Occasional spit-up is normal, but forceful vomiting or bile-colored vomit needs same-day medical evaluation.
- Poor weight gain or feeding refusal: Colicky babies eat normally between crying bouts. A baby who isn’t feeding well or is losing weight has something else going on.
- Fewer than 6 wet diapers in 24 hours: This can signal dehydration or inadequate feeding, neither of which is related to colic.
- Difficulty breathing: Any change in your baby’s breathing pattern during or between crying episodes is a reason to seek care immediately.
If your baby is breathing normally, producing 6 to 8 wet diapers a day, feeding well, and has no fever, the crying is very unlikely to reflect a serious medical problem.
The Timeline You Can Expect
Colic typically begins in the first 2 to 3 weeks of life, peaks around 6 weeks, and gradually improves. Most babies are significantly better by 3 months, and nearly all have outgrown it by 4 months. That timeline can feel impossibly long when you’re in the thick of it, but the condition is self-limiting. It does not cause lasting harm to your baby, though some research suggests a subset of children who had colic may be more prone to functional digestive issues later in childhood.
The hardest part of colic is often what it does to parents, not the baby. If you’re feeling overwhelmed during a crying bout, putting your baby down safely in their crib and stepping away for a few minutes is a reasonable and sometimes necessary choice.