You’ve fed your baby, burped them, checked for a fever, and they are still crying. Not for a few minutes. For hours.
If this has become your daily reality, you are not alone. Infantile colic affects roughly 20% of newborns in the first few weeks of life, according to data from the National Institutes of Health.
The question most formula-feeding parents quickly ask is: could the formula be making this worse?
It is a fair question, and it deserves a clear answer. For most infants, formula is not the cause of colic. For a smaller group of babies, though, the type of protein in their formula can significantly worsen symptoms. Knowing exactly what situation your baby is in can save you weeks of unnecessary formula switching and help you have a more focused conversation with your pediatrician.
This blog walks you through what colic actually is, how formula fits into the picture, and what your doctor considers before recommending a change.
Key Takeaways
- Most infant colic is a temporary developmental phase and is not caused by baby formula.
- Formula changes are considered only when crying is accompanied by clinical signs such as poor growth, abnormal stools, eczema, or significant vomiting.
- Cow’s milk protein allergy is the primary reason formula type matters in colic, but it affects a small minority of infants.
- Extensively hydrolyzed formulas are the first-line option for suspected protein allergy, while amino acid formulas are reserved for severe or unresponsive cases.
- Formula changes require a structured trial of several weeks; frequent switching makes it difficult to assess whether symptoms are truly improving.
Why Colic Is So Common in Young Infants
Clinically, colic is defined by the “rule of threes”: crying for at least three hours a day, more than three days a week, for at least three weeks, in an otherwise healthy and well-fed infant. Symptoms typically peak around six weeks of age and resolve on their own by 12 weeks in about 60 percent of cases, and by 16 weeks in roughly 90 percent of cases.
Despite how distressing it feels, fewer than 5 percent of colic cases have an identifiable underlying medical cause. That means the majority of colicky babies are neurologically typical, growing well, and simply going through a difficult developmental phase.
What Research Does and Does Not Confirm About the Cause
The cause of colic is not fully understood. Proposed explanations include gut dysmotility, an immature nervous system, altered gut microbiome, and visceral hypersensitivity. None has been confirmed as the single driver across all infants.
One finding worth noting: colic affects formula-fed and breastfed infants at similar rates. This tells us that the feeding method alone is not the cause of the problem.
Suggested Read: A New Parent’s Guide To Cluster Feeding
Can Baby Formula Cause or Worsen Colic Symptoms?
For most babies, standard infant formula does not cause colic or worsen it. Colic affects both breastfed and formula-fed infants and is generally linked to developmental immaturity rather than the formula itself.
Because of this, changing the formula is rarely the first step recommended when excessive crying is the only concern. Many babies improve gradually over time with consistent routines and soothing strategies, even when the formula remains unchanged.
Here’s what that means in practice:
- Crying alone is usually not a reason to change the formula.
- Normal feeding and steady weight gain suggest formula tolerance.
- Switching formulas without guidance rarely shortens colic.
That said, formula can play a role for a smaller group of infants. When this happens, it is usually related to how a baby reacts to the protein in standard cow’s milk–based formula, not the brand or lactose content.
Cow’s milk protein allergy (CMPA) is an immune-mediated condition that can cause intestinal discomfort and inflammation, which may worsen or prolong colic-like symptoms.
A key distinction to keep in mind:
- Allergy-related discomfort rarely presents as crying alone.
- Additional symptoms are usually present.
According to the American Academy of Pediatrics, signs that may suggest formula protein intolerance or allergy include:
- Skin rashes or eczema.
- Blood or mucus in the stool.
- Vomiting beyond typical spit-up.
- Ongoing digestive issues.
- Poor weight gain or slowed growth.
In short, baby formula does not usually cause colic. When colic is accompanied by other symptoms, formula tolerance may play a role and should be assessed in a targeted, guided way.
When Doctors Consider a Formula Change for Colic
Pediatricians do not recommend formula changes for every crying infant. Specific clinical signs shift the evaluation toward whether the formula is contributing to the problem.
Clinical Signs That Suggest Formula Choice Matters
Your pediatrician may consider a formula change if your baby shows a combination of the following:
- Persistent or worsening crying beyond three to four months; classic colic typically starts to resolve by this point.
- Blood or mucus in stool, a well-documented indicator of cow’s milk protein allergy, is not typical colic.
- Poor weight gain or growth faltering can result from allergic reactions that impair nutrient absorption.
- Moderate to severe eczema that does not respond to standard management
- Significant vomiting paired with distress, beyond typical spitting up.
- Family history of food allergies: This raises the likelihood of an immune-mediated response.
If your baby is gaining weight well, has normal stools, and the crying follows a predictable pattern with a clear start and end time each day, the formula may not be the source. Your doctor may focus on other management strategies first.
Suggested Read: Comfortable Breastfeeding Positions You Can Try
Types of Formula Commonly Used for Babies With Colic-Like Symptoms
Not every formula works the same way, and not every specialized formula is appropriate for every baby. Here is a breakdown of the main categories your pediatrician may discuss, along with how each one works.
1. Standard Cow’s Milk–Based Formula
When no formula change is needed
For the majority of formula-fed infants with colic, standard cow’s milk–based formula is not the cause of symptoms, and switching is unnecessary.
These formulas, such as Enfamil Infant and Similac Advance, are the appropriate starting point for healthy infants who are growing well and have no signs of protein allergy or digestive intolerance. When crying is the only concern and weight gain is normal, pediatricians typically focus on soothing strategies, feeding techniques, and reassurance.
In these cases, colic is considered a developmental phase rather than a feeding problem.
2. Extensively Hydrolyzed Formulas
When a cow’s milk protein allergy is suspected
If colic-like crying is accompanied by additional symptoms, such as feeding discomfort, eczema, blood in stools, or vomiting, a cow’s milk protein allergy may be considered.
When CMPA is suspected, the pediatrician often recommends an extensively hydrolyzed formula as the first dietary step. In these formulas, milk proteins are broken down into very small fragments that are less likely to trigger an immune response.
Common examples include:
- Nutramigen (Enfamil): An extensively hydrolyzed casein-based formula that includes the probiotic LGG. When CMPA is the underlying cause, many infants experience reduced crying within the first few days of use.
- Similac Alimentum (Abbott): A hydrolyzed casein formula available in ready-to-feed options that are lactose-free and corn-free. It is designed for infants with protein sensitivity and supports overall growth and development.
3. Amino Acid–Based Formulas
For severe or unresponsive cases
If symptoms do not improve after an adequate trial of an extensively hydrolyzed formula, or if the initial presentation is severe, pediatricians may consider an amino acid–based formula.
These formulas contain no intact protein fragments and are made entirely of individual amino acids, making them the most hypoallergenic option available. Clinical guidance indicates that only about 10 percent of infants with CMPA require this level of intervention.
Examples include:
- PurAmino (Enfamil): Indicated for severe cow’s milk allergy, multiple food allergies, or related gastrointestinal conditions.
- EleCare (Abbott): Designed for infants who require a hypoallergenic, easily absorbed formula and typically introduced under specialist guidance.
- Neocate Infant (Nutricia): A medical food produced in a dairy protein-free facility, available in multiple formulations for infants with complex allergic conditions.
These formulas are usually prescribed by a pediatric allergist or gastroenterologist and are used only when clearly medically indicated.
Suggested Read: Prenatal Vitamins Explained: Finding the Best Formula with Folic Acid
How Long Does It Take to See Improvement After Switching Formula?
Knowing what to expect after a formula change can help you stay the course and track progress more accurately.
For infants whose colic is related to cow’s milk protein allergy, clinical evidence suggests that a response to an extensively hydrolyzed formula may take two to five weeks. Some studies, however, have observed noticeable improvement within the first week of use.
For amino acid-based formulas, improvement may come a bit sooner in cases of immediate-type allergic reactions, but a clear picture typically still requires several weeks.
A few practical points to keep in mind as you wait:
- Do not switch again before the two-week mark. Switching too early makes it genuinely difficult to tell whether the first formula was beginning to work.
- Keep a written log. Tracking feeding times, crying duration, stool appearance, and any skin changes gives your pediatrician concrete data at follow-up.
- Set a check-in date. Most clinicians recommend a follow-up appointment two to four weeks after starting a new formula to assess growth and symptoms together.
What Formula Changes Cannot Fix in Colic?
A formula switch will not help colic that is not driven by protein allergy or intolerance. Since most colic cases fall into this category, it covers many families.
Specifically, a formula change is unlikely to make a significant difference if:
- Your baby’s crying follows a predictable evening pattern with clear start and end times, a hallmark of classic colic.
- Symptoms began around 2 weeks of age and have been improving gradually over time, consistent with a normal developmental trajectory.
- There are no additional signs involving skin, stool, or weight gain that point toward an allergic or digestive condition.
In these cases, the more productive path is usually supporting your baby through the phase with evidence-informed soothing strategies, while also making sure you have the support you need as a parent.
Supporting a Colicky Baby Beyond Formula
Whether or not formula is part of the picture, there are strategies that may help reduce crying or make the experience more manageable for your family.
What Has Some Clinical Support
- Responsive feeding techniques, including paced bottle feeding and keeping your baby upright during and after feeds.
- Reducing environmental stimulation during peak fussy periods.
- Gentle rhythmic motion and consistent background noise, which many parents find helpful.
- Lactobacillus reuteri probiotic has shown some benefit in reducing crying time, specifically in breastfed infants; evidence in formula-fed infants remains limited.
What Does Not Have Strong Evidence
- Simethicone drops (Gas-X, Infacol): Safe, but clinical trials show results comparable to placebo.
- Gripe water: Not recommended by the AAP; formulations vary widely, and some contain ingredients not appropriate for infants.
- Lactase drops: Current evidence does not support lactase supplementation as a treatment for colic.
A note for caregivers: Excessive infant crying is a documented stressor, and the exhaustion and frustration it causes are real. If you are finding it difficult to cope, talking to your pediatrician or a mental health professional is an appropriate and important step. The goal is to support you and your baby through this period.
Conclusion
Colic often pushes parents to search for immediate fixes, especially around feeding. In reality, most babies do not need to change to formula to get through this phase. The most helpful step is knowing when a formula is relevant and when it is not.
When colic is linked to protein intolerance or allergy, a carefully chosen formula can make feeding more comfortable. These decisions work best when guided by a pediatrician and followed consistently. Clear plans reduce uncertainty and prevent unnecessary switching.
If a specialty formula has been prescribed, managing access should not feel overwhelming. Insurance Covered Baby Formula supports families by reviewing coverage, handling documentation, and coordinating delivery when eligible. Reach out to get clarity on your options and move forward with confidence.
FAQs
1. Can colic come back after it seems to improve?
Colic symptoms can fluctuate week to week, but once consistent improvement begins after three to six months, true colic rarely returns unless another medical issue develops.
2. Does switching bottle type or nipple flow help colic?
Changing bottles or nipple flow may reduce air swallowing for some babies, but evidence is limited, and these changes rarely resolve colic on their own.
3. Should parents stop breastfeeding to see if formula helps colic?
Breastfeeding does not need to stop for colic alone; dietary adjustments or allergy evaluation are considered only when additional symptoms suggest feeding intolerance.
4. Is colic linked to long-term digestive or behavioral problems?
Colic is not associated with long-term digestive disorders or behavioral issues, and most affected infants grow and develop normally once the crying phase resolves.
5. Can parental stress make colic worse?
Parental stress does not cause colic, but caregiver exhaustion can affect coping and feeding routines, making support for parents an important part of colic management.