Colic typically lasts until 3 to 4 months of age, though some babies continue to have symptoms until 6 months. The condition most commonly begins between the second and fourth weeks of life, peaks in intensity around six weeks, and then gradually improves. About one in five babies develops colic, and while it can feel endless in the moment, it is temporary and resolves on its own in nearly all cases.
The Typical Colic Timeline
Colic follows a fairly predictable arc. It tends to appear in the first six weeks of life, with most parents noticing the pattern start between weeks two and four. Crying intensity peaks around the six-week mark, which is often when parents feel the most overwhelmed and start seeking answers.
From that peak, symptoms gradually taper. Most babies are significantly better by 3 months. For a smaller group, colicky crying stretches to 4, 5, or even 6 months before it finally stops. By 6 months, the vast majority of colicky babies have outgrown the condition entirely. If intense, inconsolable crying continues beyond 6 months, something other than colic is likely going on, and it’s worth a closer look from your pediatrician.
What Colic Actually Looks Like
Colic is defined by the “Rule of Three”: crying for more than 3 hours a day, at least 3 days a week, for at least 3 weeks, in an otherwise healthy baby. The crying is inconsolable, meaning nothing you do seems to help. Babies often scream, extend or pull up their legs, and pass gas. Episodes tend to be worse in the evening and night, and they usually don’t have an obvious trigger like hunger or a dirty diaper.
The key feature that separates colic from a medical problem is that colicky babies are otherwise thriving. They eat normally, gain weight on track, and between episodes they seem perfectly fine. Colic affects 10 to 30 percent of infants worldwide, so while it can feel isolating, it’s extremely common.
Why Colic Happens
There’s no single, definitive cause. The current understanding is that colic is a gut-brain condition, meaning it involves both the digestive system and the developing nervous system. Colicky babies show signs of low-grade inflammation throughout the body, and specific types of gut bacteria have been linked to colic severity. Researchers have found that the composition of an infant’s gut bacteria can predict further crying at four weeks with up to 65 percent accuracy.
The broader picture is that a newborn’s digestive tract and nervous system are still maturing. Some babies seem to have a harder time processing that transition, leading to discomfort and prolonged crying. This is also why the condition resolves on its own as the baby’s body catches up developmentally.
What Can Shorten Crying Time
No treatment makes colic disappear overnight, but some approaches can take the edge off. A specific probiotic strain has shown the most promising results in clinical trials. In a meta-analysis of four trials involving 345 infants, babies given the probiotic cried about 25 fewer minutes per day compared to those given a placebo by day 21. They were also nearly twice as likely to show meaningful improvement. However, this benefit was dramatic only in breastfed infants and insignificant in formula-fed babies. If you’re breastfeeding and interested in trying a probiotic, your pediatrician can point you to the right one.
Dietary changes can also help in some cases, though less than 5 percent of colicky crying is caused by food sensitivity. If you’re nursing, eliminating one potential irritant at a time from your diet (dairy, caffeine, onions, or cabbage are common culprits) and waiting about two weeks gives you a fair test of whether it makes a difference. For formula-fed babies, switching to a hydrolyzed protein formula occasionally helps, sometimes within a few days.
Practical soothing strategies still matter even when they don’t stop the crying completely. Swaddling, white noise, gentle motion, and skin-to-skin contact can all reduce the intensity. Spacing feedings at least 2 to 2.5 hours apart from the start of one to the start of the next may also help some babies.
Colic vs. Reflux
One of the most common questions parents have is whether the crying is colic or reflux. The distinction matters because reflux sometimes needs treatment, while colic does not. With colic, crying episodes tend to be random, worse at night, and not connected to feeding. The baby eats normally and gains weight on schedule.
Reflux looks different. Babies with reflux cry and arch their backs during or right after feeding. They may spit up more forcefully or frequently, refuse to eat, wheeze or cough during feeds, or gain weight slowly. If the crying is clustered around mealtimes and your baby seems uncomfortable eating, that pattern points more toward reflux than colic.
The Toll on Parents
Colic’s timeline matters not just for the baby but for the adults trying to survive it. Research published in Pediatrics found that mothers whose infants cried inconsolably for more than 20 minutes a day had four times the odds of scoring in the range for depressive symptoms. Even meeting the broader definition of colic doubled a mother’s risk. These numbers make it clear that colic is a family-level challenge, not just an infant one.
Knowing the timeline helps. If your baby is around six weeks old and the crying is at its worst, you’re likely at or near the peak. That doesn’t make the next few weeks easy, but it means the hardest part is already here, and it gets better from this point forward. Taking breaks, accepting help, and recognizing that the crying is not a reflection of your parenting are all part of getting through it.