Colic, unexplained crying in an otherwise healthy baby, has been a mystery for a long time, but gut research has given some of the most useful clues into what might be happening, and it usually clears up by three to four months. If you're in the exhausting middle of it right now, there's a specific probiotic with real clinical evidence, a feeding check worth doing today, and a clear list of what to try first.
Colic is typically defined as crying for more than three hours a day, more than three days a week, for at least three weeks, in a baby who's otherwise growing and feeding normally. It usually starts around two to three weeks old. Estimates of how many babies are affected vary a lot across studies, generally landing somewhere between 5% and 25% of infants, so if you're going through this, you're far from alone.
Several studies have found babies with colic show measurably different gut bacteria than babies without it, usually less variety and lower levels of certain beneficial bacteria, alongside more gas-producing bacteria.
A specific strain, Lactobacillus reuteri, has been studied in several clinical trials for colic and has shown less crying time in some studies, especially in breastfed babies. The evidence is more mixed for formula-fed babies. Results vary between studies and not every baby responds, but it remains one of the more promising options and is generally considered safe for infants when used as directed.
Feeding technique matters more than a lot of parents realize. A poor latch during breastfeeding or the wrong bottle teat can lead to swallowing extra air, which makes gas and discomfort worse. Slowing down feeds and pausing to burp partway through can help. If a breastfeeding parent notices a pattern between their own diet and the baby's crying, a temporary trial without dairy has some supporting evidence, since cow's milk protein can pass into breast milk and irritate a sensitive baby's gut.
If your baby is showing signs of colic, start by ruling out other causes with your doctor or health visitor, since some medical conditions can look similar. If you're breastfeeding, get your latch checked by a lactation consultant, and think about a two-week trial without dairy in your own diet if a pattern seems to exist, reintroducing it afterward to confirm. Ask your pediatrician about Lactobacillus reuteri drops as an option, especially if you're breastfeeding. And keep a simple log of crying episodes and feeding times for a week, patterns are often easier to spot on paper than in the moment, especially at 2am.
This content is for educational purposes only and is not a substitute for professional medical advice.