Infant Colic

What is infant colic?

Infant colic is a pattern of frequent, prolonged, and intense crying or fussiness in an otherwise healthy, well-fed baby. The crying often has no clear reason, is hard to soothe, and tends to happen in the late afternoon or evening. Infant colic usually begins in the first few weeks of life, is often most noticeable around six weeks of age, and in most babies fades on its own by three to four months.

Colic is not a disease. Doctors describe it as a behavioral pattern that sits at the far end of normal infant crying. All babies cry, and crying naturally increases in the early weeks. Colic is the term used when the crying is more frequent, more intense, and harder to comfort than expected, yet the baby is growing normally and no medical cause can be found.

Infant colic affects babies of all backgrounds. It occurs in both breastfed and formula-fed infants, in boys and girls, and in firstborn and later children. Because the crying is distressing for parents and caregivers, colic is one of the most common reasons families visit a pediatrician (a doctor who specializes in the care of children) in the first months of a baby’s life.

Infant colic symptoms

Infant colic symptoms center on crying, but the way the crying looks and sounds is often different from ordinary hunger or tiredness. Common features include:

• Intense crying that may sound more like screaming or an expression of pain
• Crying with no obvious cause, such as hunger, a wet diaper, or being too hot or cold
• Predictable timing, often in the late afternoon or evening
• Episodes that are hard to soothe, even with feeding, rocking, or holding
• Body tension, such as clenched fists, a stiff or arched back, or legs pulled up toward the belly
• A flushed, red face during crying spells
• Passing gas or a tense, swollen-looking belly, often because air is swallowed while crying
• Calm periods in between, when the baby feeds, sleeps, and interacts normally

A traditional way to describe colic is the so-called rule of threes: crying for more than about three hours a day, on more than three days a week, for at least three weeks. Many doctors now use looser descriptions, because a baby does not need to meet an exact time threshold for the family to need help and reassurance.

Symptoms often follow a rough timeline. In the first two to three weeks of life, crying spells may start gradually. The pattern typically peaks at around six weeks, when episodes can be longest and most intense. After that, most babies slowly improve, and the pattern usually resolves by the end of the third or fourth month. Some babies, particularly those born prematurely, may follow a slightly later timeline.

Importantly, babies with colic continue to feed well, gain weight, and develop normally. Crying that comes with poor feeding, weight loss, fever, vomiting, or changes in the baby’s stool is not typical of colic and should be checked by a doctor.

Causes and risk factors

The exact infant colic causes are not fully understood. Most experts believe colic is not caused by one single problem but by a combination of factors related to a young baby’s developing body and nervous system. Theories that are commonly discussed include:

• An immature digestive system. A newborn’s gut is still learning to move food and gas efficiently, which may cause discomfort.
• Gas and swallowed air. Babies may swallow air during feeding or crying, and trapped gas can add to fussiness.
• Differences in gut bacteria. Some research suggests that the balance of bacteria in the intestines of babies with colic may differ from that of other babies, though this is not proven to be a cause.
• Sensitivity to cow’s milk protein or other foods. In a small number of babies, a reaction to proteins in formula or in a breastfeeding parent’s diet may contribute to symptoms.
• An immature nervous system. Young babies may struggle to calm themselves after becoming overstimulated, particularly at the end of the day.
• Normal developmental crying. Some doctors view colic simply as the upper range of a normal crying curve that all babies pass through in the early months.

It is worth stressing what does not cause colic. Colic is not caused by poor parenting, and it is not a sign that a baby is spoiled or that a parent is doing something wrong. Both breastfed and formula-fed babies develop colic at similar rates.

Risk factors that have been studied include being born prematurely, exposure to tobacco smoke during pregnancy or after birth, and a family history of similar crying patterns. Some studies have looked at maternal stress or anxiety around the time of birth, but these associations are not consistent, and colic often occurs with none of these factors present.

Infant colic diagnosis

There is no single test for infant colic. Infant colic diagnosis is a clinical diagnosis, meaning that the doctor confirms it by listening to the family’s description, examining the baby, and ruling out other conditions that can cause excessive crying.

During the visit, the doctor will usually ask about:

• When the crying started, how long episodes last, and what time of day they occur
• How the baby feeds, how often, and whether there is vomiting or difficulty swallowing
• Wet and dirty diapers, including the color and consistency of stools
• The baby’s sleep pattern and general behavior between crying spells
• Any fever, cough, rash, or other signs of illness
• What the family has already tried to soothe the baby

A full physical examination is an essential part of the assessment. The doctor checks the baby’s weight, length, and head size against growth charts, looks at the skin, eyes, ears, and mouth, feels the abdomen, and examines the hips, limbs, and groin. This helps rule out problems such as an ear infection, a hernia (a bulge where tissue pushes through a weak spot in the abdominal wall), a hair or thread wrapped tightly around a finger or toe, a scratch on the eye, or a bone injury.

Doctors often refer to formal definitions, such as the Rome criteria for functional gastrointestinal disorders. In simple terms, these describe colic as recurrent and prolonged periods of crying, fussing, or irritability that start and stop without obvious cause, in a baby under about five months of age, who has no fever, illness, or failure to gain weight.

Blood tests, urine tests, stool tests, or imaging such as an ultrasound are not routinely needed to diagnose colic. Your doctor may order them only if something in the history or examination points to another cause, for example a urinary tract infection, gastroesophageal reflux disease (stomach contents flowing back up the food pipe and causing pain), or an allergy to cow’s milk protein. In some cases, a doctor may ask the family to keep a crying and feeding diary for a week or two to see the pattern more clearly.

Infant colic treatment options

Because colic is not a disease and improves on its own, infant colic treatment focuses on comforting the baby, supporting the family, and addressing any specific contributing factor that a doctor identifies. No single approach works for every baby, and it is common to try several strategies before finding what helps.

Soothing and comfort techniques

Most doctors recommend starting with simple, low-risk soothing methods. These may include:

• Holding the baby close, skin-to-skin, or carrying the baby in a sling or carrier
• Gentle, rhythmic movement, such as rocking, walking, or a ride in a stroller
• Swaddling (wrapping the baby snugly in a light blanket) while the baby is awake and supervised
• Soft, steady background noise, such as a white-noise machine, a fan, or quiet humming
• Reducing stimulation by dimming lights and lowering noise in the evening
• Offering a pacifier if the baby accepts one
• Giving a warm bath or gently massaging the baby’s belly and back

These techniques do not shorten the overall course of colic, but in many cases they make individual episodes more manageable.

Feeding adjustments

Feeding changes are sometimes helpful. For formula-fed babies, this may mean checking the bottle and nipple flow, holding the baby more upright during feeds, and pausing to burp the baby more often to reduce swallowed air. For breastfed babies, a doctor or lactation consultant may review positioning and latch.

If a doctor suspects sensitivity to cow’s milk protein, they may suggest a time-limited trial of an extensively hydrolyzed formula (a formula in which the milk proteins are broken into very small pieces) or, for breastfeeding parents, a temporary trial of removing dairy from their own diet. These changes should be guided by a doctor, because unnecessary formula switching or restrictive diets can create new problems. Changing formula repeatedly without medical advice is generally not recommended.

Medication and supplements

No medication is considered a standard cure for colic. Simethicone drops, which are designed to break up gas bubbles, are widely available and generally considered safe, but studies have not consistently shown that they reduce crying more than a placebo. Some research suggests that a specific probiotic (a supplement containing live, beneficial bacteria) may reduce crying time in breastfed babies, but the evidence is less clear for formula-fed babies, and results vary. Your doctor may discuss whether a probiotic is worth trying in your baby’s situation.

Herbal teas, gripe water, and other over-the-counter remedies are not recommended without medical advice. Their ingredients are not always regulated, some may contain sugar or alcohol, and giving extra liquids can reduce a baby’s milk intake. Medications used for reflux are not helpful for colic alone and are reserved for babies with a confirmed reflux problem.

Procedures and surgery

Colic is a self-limiting behavioral pattern, and there is no procedure or surgery to treat it. Chiropractic manipulation, spinal adjustments, and similar physical treatments have not been shown to be effective and are not recommended for infants. If a physical cause of crying such as a hernia is found, that condition is treated separately.

Support for caregivers

Caring for a baby with colic is exhausting, and supporting the family is a core part of treatment. Doctors often encourage parents to share nighttime duties where possible, accept help from relatives and friends, and take short breaks when the baby is safely placed in a crib. If frustration builds, it is safe and reasonable to put the baby down in a safe place and step away for a few minutes to calm down. A baby should never be shaken, because shaking can cause serious, permanent brain injury.

In many hospital systems, colic and other infant feeding and behavior concerns are evaluated within the pediatrics department, where general pediatricians can coordinate with lactation specialists or pediatric gastroenterologists if needed.

Living with infant colic and outlook

The outlook for infant colic is generally very good. In most babies, crying improves noticeably after the six-week peak and largely resolves by three to four months of age, although some babies take a little longer. Colic does not appear to cause lasting harm to a baby’s digestion, growth, or development, and babies who had colic typically go on to develop just like other children.

The greater impact of colic is often on the family. Weeks of intense crying can lead to sleep loss, anxiety, feelings of guilt or helplessness, and strain between partners. Parents may worry that they are missing a serious illness or that they are failing their child. These feelings are common and understandable. Talking openly with your doctor, keeping a simple crying diary to see gradual improvement, and building a practical support network can make this stage easier to get through.

It can also help to remember that the crying is not a reflection of the baby’s bond with the caregiver. Babies with colic are just as attached to their parents as other babies, and the calm periods between episodes are a good time for feeding, cuddling, and play.

Postpartum depression and anxiety are more common among parents of babies with prolonged crying. If low mood, persistent worry, or difficulty coping lasts more than a couple of weeks, this is worth raising with your own doctor, because support is available and effective.

Frequently asked questions

What are the first signs of infant colic?

Early infant colic symptoms usually appear in the second or third week of life. Parents often notice that the baby cries intensely at a similar time each day, most often in the evening, and that the crying is harder to soothe than usual. The baby may clench the fists, pull the legs up, and pass gas, yet feed and grow normally at other times.

What causes infant colic in babies?

The exact infant colic causes are not known. Most doctors believe it results from a combination of an immature digestive system, swallowed air and gas, an immature nervous system that struggles to settle after stimulation, and, in a small number of babies, sensitivity to cow’s milk protein. Colic is not caused by parenting style, and it occurs in both breastfed and formula-fed babies.

How is infant colic diagnosis made without tests?

Infant colic diagnosis is based on the pattern of crying and a thorough physical examination that rules out other causes. If the baby is gaining weight well, has no fever or signs of illness, and the examination is normal, doctors can usually diagnose colic without blood tests or imaging. Tests are ordered only if something points toward another condition.

What is the most effective infant colic treatment?

There is no single infant colic treatment that works for every baby. Soothing methods such as holding, rocking, swaddling, and white noise are usually tried first. Feeding adjustments and burping may help some babies. Your doctor may discuss a probiotic or a time-limited formula change in specific situations. Simethicone drops are safe but have not consistently proved better than placebo.

Does infant colic mean my baby has a milk allergy?

Not usually. Most babies with colic do not have a milk allergy. A doctor may consider cow’s milk protein sensitivity if crying comes with other signs such as eczema, blood or mucus in the stool, frequent vomiting, or poor weight gain. In those cases, a supervised trial of a hydrolyzed formula or a dairy-free diet for the breastfeeding parent may be suggested.

How long does infant colic last?

Infant colic usually begins in the first few weeks, is most intense around six weeks, and improves gradually. In most babies it has largely resolved by three to four months of age, though some, including babies born early, may take a little longer. If intense crying continues well beyond this age, your doctor may want to reassess the baby.

Can gripe water or herbal drops cure infant colic?

No product has been shown to cure colic. Gripe water and herbal preparations are not consistently regulated, and some contain sugar, alcohol, or other ingredients not suitable for infants. Extra fluids can also reduce milk intake. It is best to ask your doctor before giving any remedy, supplement, or medication to a baby.

When to see a doctor

Colic itself is not dangerous, but excessive crying can occasionally be a sign of another problem. It is reasonable to have any baby with persistent, hard-to-soothe crying checked by a pediatrician, both for reassurance and to rule out other causes. Seek medical attention promptly, or emergency care where appropriate, if your baby has any of the following:

• A fever, particularly in a baby under three months of age
• Poor feeding, refusing several feeds in a row, or signs of dehydration such as fewer wet diapers, a dry mouth, or a sunken soft spot on the head
• Repeated or forceful vomiting, especially if it is green, yellow, or contains blood
• Blood or mucus in the stool, or stools that are very pale or black
• A swollen, hard, or tender belly
• Poor weight gain or weight loss
• Unusual drowsiness, floppiness, or difficulty waking
• A high-pitched or weak cry that sounds different from the usual pattern
• Breathing difficulty, bluish lips or skin, or pauses in breathing
• A rash, particularly one that does not fade when pressed
• A bulge in the groin or around the navel that appears or becomes painful during crying
• Any injury or a moment when the baby was shaken, dropped, or handled roughly

You should also seek help if the crying pattern changes suddenly, if it continues well past four months of age, or if you feel overwhelmed, angry, or unable to cope. Reaching out for support in these moments protects both the baby and the caregiver, and doctors regard this as a normal and responsible part of caring for a baby with colic.