Baby Colic: What It Is, What Causes It and How to Survive It

What Colic Actually Is: The Rule of Threes

Colic is clinically defined using the "rule of threes": crying for more than 3 hours per day, more than 3 days per week, for more than 3 weeks, in an otherwise healthy, well-fed baby. This definition is diagnostic — it tells you that the crying is excessive by any normal measure and is not simply hunger or a dirty diaper. Colic affects approximately 1 in 5 babies regardless of feeding method (breastfed or formula-fed), birth order, or parenting approach.

The crying associated with colic has a distinctive character: it tends to come on suddenly and intensely, often in the late afternoon or evening, the baby may clench their fists, arch their back, and seem inconsolable despite all efforts. The episode ends as suddenly as it began. Between episodes, the baby is typically well, feeding adequately and gaining weight normally — which is what distinguishes colic from a medical condition requiring treatment.

What Causes Colic (and What Does Not)

Despite decades of research, the exact cause of colic remains unknown, and this is part of what makes it so difficult to treat. Proposed causes have included gut immaturity, gut microbiome dysbiosis, food sensitivities (particularly to cow's milk protein), gas pain, overstimulation of an immature nervous system, maternal anxiety, and even tobacco smoke exposure. None of these has been established as the primary cause in all or even most cases.

Several things that parents commonly suspect as causes of colic — maternal diet (beyond dairy elimination), formula brand, feeding schedule, and infant temperament — have not been shown to cause colic in well-designed studies. Colic is not caused by bad parenting, inadequate feeding, or anything you are doing wrong. Understanding this may not make the crying easier to bear, but it should remove any guilt from the equation.

What Does Not Help

Many remedies marketed for colic have been tested in clinical trials and found to be ineffective or potentially harmful. Gripe water, simethicone gas drops, and herbal teas have not been shown to reduce colic duration or severity compared to placebo in high-quality studies. Chiropractic manipulation and cranial sacral therapy have very limited and methodologically weak evidence. Changing formula brands repeatedly or eliminating multiple maternal food groups simultaneously is usually unproductive and can cause nutritional problems.

It is important to resist the pressure to try one remedy after another — not only is this financially and emotionally costly, but the improvement that naturally occurs as colic resolves on its own can be attributed to whatever the last intervention was, creating false beliefs about what helped. The most honest thing to say about most colic remedies is that the baby would have gotten better anyway.

What Research Says Helps

The interventions with the best evidence for reducing colicky crying are: swaddling, rhythmic motion (rocking, bouncing, car rides), white noise or other consistent sound, sucking (dummy/pacifier), and holding the baby in positions that apply gentle pressure to the abdomen (the "football hold" with baby face down along the forearm). These are all soothing techniques that tap into the baby's natural calming reflexes.

Probiotics — specifically Lactobacillus reuteri — have shown promise in breastfed colicky infants in several trials, significantly reducing crying time. The evidence is strongest for breastfed babies and the effect on formula-fed infants is less clear. If you want to try a probiotic for colic, discuss it with your pediatrician. Reducing stimulation in the evening — quieter environments, dimmer lights, fewer visitors — can also help some babies who appear to reach a sensory overload threshold by the end of the day.

When Colic Ends

Colic is self-limiting — it always ends. For most babies this happens by 3 months; for the majority it is gone by 4 months. The resolution can feel sudden — many parents describe waking up one day and realizing that the horrible crying phase has passed without a clear trigger. This can actually cause a strange mix of relief and disorientation, particularly if the household had been organized around managing the colic for weeks.

While colic is active, taking care of the parents is as important as managing the baby's crying. Colic is a well-established risk factor for parental depression, relationship strain, and in extreme cases, abusive head trauma — parents who feel they might harm their baby should put the baby down in a safe place immediately and call for help. Regular breaks, support from others, and honest conversations with your healthcare provider about how you are coping are essential during this period.

Frequently Asked Questions