The causes of colic: An evidence-based review for parents
© 2009 – 2022 Gwen Dewar, Ph.D., all rights reserved
Why parents should consider the physiological causes of colic
Colicky infants cry excessively and inconsolably. Once a colicky babe gets going, it tin be impossible to at-home him downwards.
Why? At that place are many possible answers.
Long ago, people assumed that colic was caused by abdominal pain. But the link was unproven, and so many researchers accept adopted definitions of colic that brand no reference to causation.
In fact, some have argued that colic isn't most pain–or indeed any physical ailment. (For an opens in a new windowoverview of colic, and different ideas almost the causes of colic, click hither.)
But there's strong evidence suggesting that at to the lowest degree some colicky babies endure from treatable diseases.
It's also possible that most opens in a new windowcolicky babies cry because there is something different nearly their encephalon chemistry –something that makes them more hands upset and less easily soothed.
In this commodity, I review the scientific evidence about the physiological causes of colic. Simply please keep in listen:
- This information isn't intended equally medical advice, so delight don't use information technology every bit a substitute for professional medical care.
- This data isn't intended every bit an endorsement of whatever item kind of therapy or medication.
It'south dangerous to requite babies drugs, herbal supplements, or medications of whatever kind without a doc's supervision.
The purpose of this review is to help science-minded parents empathize
(ane) why information technology's worthwhile to have your colicky baby screened for illness, even if your baby seems pretty good for you and is growing well, and
(2) why parents shouldn't blame themselves or their babies for colic.
Equally I note elsewhere, there is evidence that baby intendance influences how much babies cry. Yet, there are plenty of parents who strive to do everything right, and notwithstanding notice themselves coping with colic.
The causes of colic: Putting the risk of disease in perspective
Some researchers have noted that less than five% colic cases are caused by disease (e.g., Barr 1998).
Notwithstanding, the statistics depend on which criteria you use to ascertain colic. When criteria include symptoms of pain or gastrointestinal distress, diseases are more than likely involved.
For example, in i study, researchers included criteria like diarrhea and spasm. They establish that virtually 45% of these colicky babies responded favorably when treated for transient lactose intolerance (Kanabar et al 2001).
It also seems that severe infantile colic is linked with concrete ailments later on in life.
In 1 study, researchers tracked babies with severe colic. X years afterwards, these kids were more likely than others to suffer from recurrent intestinal hurting and/or allergies (Savino et al 2005).
Perhaps some colic cases are simply an early manifestation of long-term wellness problems.
So if your baby has colic, it'southward important to screen her for affliction. A variety of diseases tin can be causes of colic—diseases that include cow'southward milk poly peptide intolerance, carbohydrate malabsorption, infantile migraine, or acid reflux. I provide the details beneath.
Moo-cow's milk protein intolerance
I of the more common medical causes of colic is cow's milk protein intolerance (Lindberg 1999). This condition tin can affect babies who drink formula that contains cow's milk. It can likewise bear on breastfed babies whose mothers consume moo-cow's milk products.
The cure for this problem is pretty straightforward: Eliminate cow'due south milk from the diet.
In one randomized, double-blind study formula-fed babies who suffered from colic were assigned to receive moo-cow's milk formula. The other grouping of colicky babies was assigned to receive extensively hydrolyzed whey formula. At the finish of one week, the babies on extensively hydrolyzed whey formula cried about an 60 minutes less each day (Lucassen et al 2000).
Experiments that substituted casein hydrolysate formula have as well reported a reduction in colic symptoms (Forsyth 1989; Hill et al 1995; Lucassen et al 1998).
Sugar malabsorption
Cow's milk protein isn't the only ingredient that babies might take trouble digesting. One intriguing, double-blind experiment gave 5-calendar month old infants ane of two types of juice—
- apple juice (which was loftier in sorbital and had a high fructose-to-sucrose ratio), and
- white grape juice (which had no sorbital and had a low fructose-to-sucrose ratio)
Then researchers measured how much hydrogen the babies excreted when they exhaled, an indicator of saccharide malabsorption. The squad discovered that some babies—those who had been colicky when they were younger—showed signs of saccharide malabsorption after drinking the apple juice. Immediately later on drinking the apple juice, these babies as well cried more and slept less (Duro et al 2002).
The results imply that some colicky infants might take trouble arresting carbohydrates.
Is transient lactose intolerance i of the causes of colic?
There is also strong evidence that some babies suffer from a transient inability to digest lactose, the sugar in milk. Transient lactose intolerance is usually caused past acute diarrhea, which damages the mucosal lining of the intestinal wall (Bartrop and Hull 1973). Information technology tin can besides be acquired by malnutrition and cystic fibrosis.
If your baby suffers from transient lactose intolerance, your dr. volition probably focus on treating the crusade (due east.g., the diarrhea). The intestinal lining will heal and symptoms should improve within a couple of weeks. Putting your babe on a lactose-free diet is probably not worthwhile. And babies with transient lactose intolerance should go along breastfeeding (Heyman 2006; Heubi et al 2000).
Simply your physician might also prescribe infant-formulated drops that contain lactase, the enzyme that converts lactose into simple sugars (Buckley 2000).
Infantile migraine
This may exist a relatively rare condition. Information technology's also difficult to identify considering many of the signs of migraine are similar to signs of other illnesses…or even fatigue: intermittent head-belongings, head tilting, pilus- or ear-pulling, crying, irritability, vomiting, or pallor. In the case of migraines, these symptoms usually better later on a brief nap (Barlow 1994).
Might infantile migraine be i of the causes of colic—at least for a few infants? It seems very possible.
There is a case reported in the pediatric literature of a baby whose colic symptoms improved dramatically later handling for migraine. In that location are also studies demonstrating a correlation between colic and childhood migraine—i.e., case control studies where researchers matched child migraine sufferers with a command group of like, but migraine-free, children. In ane study, researchers institute that kids with migraine were 4 times equally likely to have suffered from colic equally babies (Jan et al 2001).
In another report of 154 female parent-infant pairs, babies whose mothers had a history of migraines were 2.6 times as likely to have colic (Gelfand et al 2012).
Needless to say, parents who are worried nigh infantile migraine demand to consult a pediatrician. And they should never requite their babies any medication unless it has been specifically prescribed by a physician.
GERD (gastroesophageal reflux disease)
Sometimes the sphincter muscles at the bottom of the esophagus open up, assuasive tum contents (gas, partially digested food, or acid) back into the esophagus. That'south why babies burp and (sometimes) spit up. Information technology'southward also the cause of heartburn, or acid reflux.
When the condition is severe and chronic, it's called GERD, or gastroesophageal reflux illness. Not surprisingly, GERD hurts and makes babies cry. Symptoms of infantile GERD include frequent airsickness, frequent hiccups, difficulty swallowing, and irritability during feeding. Babies may experience pain in the esophagus, as well as the areas around the sternum and abdomen (Bhatia and Parish 2009).
If you suspect your baby has GERD, check with your pediatrician. You might also desire to read Bryan Vartabedian'southward book, opens in a new windowColic Solved: The Essential Guide to Infant Reflux and the Care of Your Crying, Difficult-to-Soothe Baby .
Vartabedian is a pediatric gastroenterologist who underwent a kind of professional person epiphany when he became a new father and his baby developed GERD. He knows how easy it can be for GERD babies to get disregarded. I wish I'd had this book when I was coping with a GERD infant.
Other causes of colic that might trigger abdominal hurting
Lactose intolerance and cow'due south milk protein intolerance aren't the only weather that tin cause painful colic. Here are some others.
Prove for cramps: Are increased gastrointestinal contractions one of the causes of colic?
Several studies suggest that colicky babies have college levels of serum motilin, a hormone that stimulates contractions or spasms in the alimentary canal (Savino et al 2007; Lothe et al 1990; Lothe et al 1987). Colicky babies may likewise have increased levels of ghrelin, a hormone that stimulates the appetite (Savino et al 2007).
And information technology's possible that one of the causes of colic pain is related to levels of serotonin and melatonin. Serotonin increases abdominal contractions, melatonin suppresses them. In children and adults, serotonin and melatonin levels peak in the evening.
Immature babies are different. Their serotonin levels tiptop in the evening, but their melatonin levels don't. As a effect, there isn't enough melatonin to annul the serotonin and babies have more cramps. This would explain why colic tends to disappear after 3 months of age. That's when melatonin circadian rhythms mature (Weissbluth and Weissbluth 1992).
Bowel inflammation
Colicky babies might have more bowel inflammation, likewise. In another study of infant stools, researchers found that colicky babies had higher levels of fecal calprotectin, a mark for inflammation of the bowel (Rhoads et al 2009).
H. pylori
In a contempo report comparison colicky infants with their healthy counterparts, 82% of the 55 infants with colic tested positive for the Helicobacter pylori bacterium — the pathogen known to cause gastric hurting and peptic ulcers in older people. Simply 23% of control infants were infected with H. pylori (Ali 2012).
Do colicky babies have an unfavorable residue of gut microflora?
In addition to whatever other issues, colicky babies may have more gas-producing bacteria in their digestive tracts. In i study, researchers examined the stools of colicky babies and compared these to the stools of normal infants. The stool of the colicky babies had college concentrations of E. coli (Savino et al 2009).
Differences in gut flora hint that colicky babies might benefit from probiotics—"friendly" microorganisms that colonize the digestive tract and help reduce bowel inflammation. And indeed, this seems to be true.
Probiotics for colicky babies
In a randomized written report of colicky, breastfed infants, Savino and colleagues assigned some babies to receive supplements of the probiotic Lactobacillus reuteri (American Type Culture Collection Strain 55730), and other babies to receive supplements of simethicone.
After 28 days, the 95% of probiotic babies were crying less (the median crying fourth dimension having dropped from 159 minutes/day to 51 minutes/twenty-four hour period). By contrast, just 7% of the simethecone babies showed whatsoever reduction in crying fourth dimension (Savino et al 2006).
You might wonder if researchers "stacked the deck" by selecting babies who had previously shown signs of digestive affliction. They did non. When recruiting their subjects, Savino's team excluded whatsoever babies that had clinical evidence of chronic disease or gastrointestinal disorders.
A more recent, double-blind randomized report of fourscore colicky infants has also reported reduced symptoms in infants given L. reuteri (Szajewska et al 2012).
Are probiotics worth trying? Maybe. Only cheque with your pediatrician offset. In some patients—such every bit those with impaired allowed systems—probiotics could be unsafe. Moreover, the quality of over-the-counter probiotics vary greatly, and different species or strains of probiotics piece of work differently. For more information, see this evidence-based article about opens in a new windowprobiotics for children.
And what about the brain? Do colicky babies have different brain chemistry?
Whether or not your babe suffers from a disease that makes him weep, it's besides possible that he'due south just dissimilar. Research suggests that colicky babies might respond differently to stimulation (St James-Roberts et al 2003).
The same things that don't bother normal babies much–similar being undressed or handled–tin really upset colicky infants.
And it appears that colicky infants might reply differently to potentially soothing stimuli–like sweet flavors.
For more information, run into this story almost opens in a new windowcolic and the brain.
References: The physiological causes of colic
For full citations of the studies cited in this commodity, opens in a new windowclick here.
Content of "Causes of colic" final modified 12/12
image of crying baby by David Buchwald / wikimedia commons
prototype of H. pylori bacteria by Patho / wikimedia commons
Source: https://parentingscience.com/causes-of-colic/
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