Colicky babies can often be calmed using a combination of physical soothing techniques that mimic the sensations of the womb, including swaddling, rhythmic shushing, and gentle rocking. No single method works for every infant, but layering several approaches together tends to be more effective than trying one at a time. Colic affects up to 25% of newborns, typically peaks around six weeks of age, and resolves on its own before five months.
What Colic Actually Is
Colic is defined by prolonged, inconsolable crying with no obvious medical cause. The classic threshold, known as the “rule of threes,” describes an infant who cries for at least three hours a day, three or more days a week, for over three weeks. More recent guidelines have moved away from those strict cutoffs, recognizing that a baby crying just under three hours a day can be equally distressing for a family. The key features are that the baby is otherwise healthy, gaining weight normally, and has no fever or signs of illness.
Recent research has shed light on what may be happening inside a colicky baby’s gut. Infants with colic show signs of low-grade intestinal inflammation and have significantly fewer beneficial bacteria called bifidobacteria compared to non-colicky babies (a median of 0.3% versus 10.1% of total gut bacteria). This doesn’t mean colic is purely a digestive problem, but it helps explain why some feeding-related strategies make a real difference.
The 5 S’s: Your First Line of Defense
Pediatrician Harvey Karp popularized a five-step soothing method designed to trigger a calming reflex by recreating conditions inside the womb. These techniques work best when used together rather than in isolation.
- Swaddling. Wrapping your baby snugly in a blanket provides the warmth and gentle pressure they felt before birth. Use a thin, breathable blanket and keep it firm around the arms but loose around the hips. Stop swaddling once your baby shows signs of rolling over.
- Side or stomach position. Hold your baby on their side or stomach against your body. This is a holding position only, not a sleeping position. Babies should always be placed on their backs to sleep.
- Shushing. A loud, steady “shhhh” near your baby’s ear mimics the sound of blood flowing through the placenta, which is surprisingly loud inside the womb. White noise machines or apps work the same way and can sustain the sound longer than you can.
- Swinging. Small, rhythmic movements like gentle swaying or rocking replicate the constant motion babies experienced in utero. The movements should be small and support the head and neck at all times.
- Sucking. Offering a pacifier or allowing your baby to nurse for comfort activates a natural calming reflex. A baby physically cannot cry and suck at the same time, which can break a crying cycle long enough for the other techniques to take hold.
Dietary Changes That Reduce Crying
If you’re breastfeeding, what you eat may directly affect your baby’s comfort. In a randomized trial, mothers who eliminated major allergens from their diet (dairy, soy, wheat, eggs, peanuts, tree nuts, and fish) saw a meaningful improvement. About 74% of babies in the low-allergen group improved by at least 25%, compared to only 37% in the control group. On average, the diet change reduced crying by about an hour and a half per day.
You don’t necessarily need to cut everything at once. Cow’s milk protein is the most common culprit, so starting there makes sense. Give each elimination about two weeks before deciding whether it’s helping. If you see improvement, you can reintroduce other foods one at a time to identify the specific trigger.
For formula-fed babies, switching to an extensively hydrolyzed formula (where the milk proteins are broken into much smaller pieces that are easier to digest) has strong evidence behind it. In a double-blind trial, babies on hydrolyzed formula cried about 63 fewer minutes per day compared to those on standard formula. Your pediatrician can recommend specific options.
Probiotics: What the Evidence Shows
A specific probiotic strain, Lactobacillus reuteri DSM 17938, has been studied extensively for colic. A meta-analysis of randomized controlled trials found it reduced crying time progressively: about 28 fewer minutes per day after one week, 43 fewer minutes after two weeks, and 56 fewer minutes per day by four weeks. The strongest evidence is for breastfed infants, with less certainty about the benefits for formula-fed babies.
Probiotic drops are available over the counter and are given once daily. They won’t produce an overnight change, but the cumulative effect over several weeks can be substantial.
Remedies That Don’t Work
Simethicone drops (sold as gas relief for infants) are one of the most commonly purchased colic remedies, but multiple systematic reviews have found no benefit over placebo. Some reviews actually noted a worsening of symptoms. Despite their popularity, the evidence simply doesn’t support their use for colic.
Gripe water is another product many parents reach for. It typically contains fennel, ginger, and baking soda, though formulations vary widely. The problem is that gripe water isn’t regulated by the FDA, so there’s no guarantee of consistent quality, safety, or accurate labeling. Older formulations contained alcohol and sugar. Modern versions have removed those ingredients, but there’s still very little research showing gripe water actually works.
When Crying Signals Something Else
True colic happens in a baby who is otherwise thriving. Certain signs suggest the crying has a medical cause that needs evaluation: fever (especially in a baby under eight weeks old), vomiting (particularly if it’s green or bile-colored), bloody or unusual-looking stools, poor feeding, failure to gain weight, extreme lethargy between crying episodes, or any bruising. A colicky baby cries intensely but is otherwise normal between episodes, feeds well, and continues to grow.
Protecting Yourself While You Cope
Colic is one of the most stressful experiences in early parenthood. Hours of inconsolable crying can push even calm, well-rested people toward a breaking point, and new parents are rarely well-rested. Research consistently shows that parental anxiety itself can worsen the cycle: a stressed caregiver has a harder time delivering soothing techniques effectively, and babies can pick up on that tension.
The single most important safety strategy is giving yourself permission to put the baby down. If you feel frustration building, place your baby on their back in the crib and walk into another room for five or ten minutes. A crying baby in a safe space is in no danger. This simple act is the most effective way to prevent the kind of desperate, impulsive response that leads to shaken baby syndrome.
Beyond that immediate safety valve, building a rotation of caregivers helps enormously. Even 30 minutes of relief can reset your ability to cope. Programs that combine reassurance about colic’s natural timeline with practical soothing strategies have been shown to reduce both parental anxiety and reported infant distress. Knowing that colic peaks around six weeks and typically resolves by three to four months doesn’t make the crying easier to hear, but it does provide a finish line to hold onto.