For an otherwise healthy formula-fed baby with colic-like crying, repeatedly switching standard formulas is usually not the best next step. Current evidence does not support low-lactose, soy, partially hydrolyzed, extensively hydrolyzed, or probiotic-enriched formulas as routine treatments for infantile colic. An extensively hydrolyzed formula should not be used for crying alone; it may be part of a clinician-guided diagnostic trial when additional symptoms or findings make cow’s-milk allergy plausible.
Start with safety: when crying needs assessment first
Colic describes recurrent, prolonged crying, fussing, or irritability in an infant younger than 5 months when the symptoms start and stop, without an obvious cause that caregivers can prevent or resolve, and without failure to thrive, fever, or illness. Unlike the historical "rule of threes," current Rome IV clinical criteria do not require a minimum number of hours, days, or weeks. Crying that is newly different or accompanied by signs that a baby seems unwell still needs assessment.
Seek prompt medical assessment rather than trying another formula if your baby has:
- Fever
- Pauses in breathing or blue coloring
- Blood in the stool
- Poor growth or concerning weight or head-growth measurements
- An inconsolable cry along with an ill appearance
- Projectile or bilious (green) vomiting; a swollen abdomen; poor feeding; dehydration; marked sleepiness; or a weak, high-pitched, or continuous cry
Colic is considered only after other possible causes have been assessed. When a clinician has taken an appropriate history, examined a baby, and found no red flags, extensive tests are usually unnecessary. For many families, reassurance and practical feeding support are the mainstays of care.
What each formula category can—and cannot—do
A formula change is most useful when it answers a specific clinical question, rather than when it is one more attempt to stop crying.
Formula category |
What the evidence supports for colic-like crying |
Practical decision |
Standard cow’s-milk formula |
No evidence suggests that routinely moving between standard formulas treats colic. |
If your baby is growing and otherwise well, avoid cycling through standard brands or varieties without a clear reason. |
Partially hydrolyzed formula |
It is not hypoallergenic and is not recommended as a colic treatment. |
Do not use it as an allergy formula or assume “gentle” means it will resolve crying. |
Extensively hydrolyzed formula |
Small trials have reported less crying, but the 2024 ESPGHAN Nutrition Committee found the evidence insufficient to recommend extensively hydrolyzed formula for infantile colic. Crying alone does not justify a cow’s-milk-elimination trial. |
Discuss it with a clinician when allergy is a reasonable concern. It is not a routine first switch for uncomplicated crying. |
Soy formula |
It is not recommended for infantile colic. |
Do not choose soy solely to treat gas, fussiness, or crying. |
Research on colic interventions is difficult to interpret. Studies have used different definitions of colic, inconsistent outcomes, and sometimes incomplete reporting of how participants were assigned to treatments. That means a promising result in one small study is not the same as a dependable solution for most babies.
There is some evidence that extensively hydrolyzed formula can reduce crying time compared with standard cow’s-milk formula. But the better explanation in some infants may be that they had unrecognized cow’s-milk-protein allergy, not that hydrolyzed formula treats colic itself. Review of infantile-colic management
When cow’s-milk-protein allergy is the more relevant question
Crying alone does not prove cow’s-milk-protein allergy. Allergy is also frequently overdiagnosed, and long-term elimination without confirmation can create nutritional risks.
A clinician may consider the overall history and decide that a diagnostic elimination trial is appropriate. For a formula-fed infant with suspected cow’s-milk allergy, a cow’s-milk-derived extensively hydrolyzed formula (eHF) tested for this purpose is generally the first option. An amino-acid formula is usually reserved for severe disease, severe nutritional impairment, or failure to tolerate or respond to an eHF. The diagnostic pathway matters:
- Discuss whether allergy is a realistic possibility. A clinician should weigh the full pattern of symptoms, feeding history, growth, and examination.
- Follow one prescribed formula consistently. A diagnostic elimination period is typically 2–4 weeks.
- Complete the planned confirmation step. After improvement, cow’s-milk protein should be reintroduced to confirm non-IgE-mediated allergy when the clinician considers home reintroduction safe. Suspected IgE-mediated allergy, food protein-induced enterocolitis syndrome (FPIES), or any history of an immediate or severe reaction requires a medically supervised oral food challenge or specialist-directed plan.
Do not use a formula response alone as proof of allergy. A baby may cry less for many reasons, including normal changes over time.
Isolated stool changes, feeding aversion, or occasional small spots of blood are not diagnostic of cow’s-milk allergy on their own. However, visible blood in an infant’s stool still warrants prompt clinical assessment, especially if it persists, recurs, or occurs with poor feeding, vomiting, diarrhea, illness, or impaired growth.
Lactose-free formula claims: what they do not establish
Lactose-free does not mean milk-protein-free
Primary and congenital lactose intolerance are extremely rare in infants. Lactose-free formula is not recommended as a treatment for colic, and it is not the same as a formula without cow’s-milk protein. Lactose-free infant formulas may still be cow’s-milk-protein based; the lactose is simply replaced with other carbohydrate ingredients.
That distinction matters. Switching to lactose-free formula is not an appropriate way to test for cow’s-milk-protein allergy, and it should not be the default response to gas or crying.
Added probiotics are not proven colic fixes
Probiotic effects are strain- and population-specific. ESPGHAN gives only weak recommendations for Limosilactobacillus reuteri DSM 17938 or Bifidobacterium lactis BB-12 in breastfed infants with colic. For formula-fed infants, evidence is insufficient to recommend for or against L. reuteri DSM 17938, and there is no basis for assuming that any probiotic-enriched formula will reduce crying.
A low-risk plan for the next few days
When a baby is crying intensely, changing several things at once can make it impossible to know what helped—or whether the crying was simply changing on its own. A steadier approach is usually more useful.
- Check for red flags first. If your baby seems ill, has fever, breathing changes, blue coloring, blood in stool, poor growth, or another concerning change, seek medical care rather than trying another formula.
- Keep one nutritionally appropriate formula unless there is a clear clinical reason to change it. Avoid moving from standard to comfort to lactose-free to soy formula in quick succession.
- If allergy is a concern, ask for a clinician-guided plan. Use the recommended formula consistently for the full trial period, and follow the planned reintroduction or challenge guidance rather than continuing an elimination diet indefinitely.
- Review formula preparation. Prepare commercial infant formula exactly as the label directs. Do not dilute it, concentrate it, add extra ingredients, or make homemade formula. Use an age-appropriate formula.
Crying is exhausting, but it is not evidence that you have failed or that every baby needs a new formula. Seek prompt care for red flags, bring possible allergy patterns to a clinician, follow any supervised formula trial consistently, and keep feeding preparation and pace as safe and simple as possible.
