Maltodextrin is one of the most common non-lactose carbohydrates in baby formula, particularly in products marketed for sensitive stomachs or milk-protein allergies, yet it remains poorly understood by most parents who encounter it on ingredient labels. It is a starch-derived ingredient with legitimate medical uses in infant nutrition, but emerging research on gut bacteria, body weight, and intestinal health has raised questions about whether it belongs in formulas used by babies who do not strictly need it. The science is genuinely mixed, and the picture is more complicated than either “perfectly safe” or “avoid at all costs.”
Why Maltodextrin Shows Up in Formula
Maltodextrin is produced by breaking down starch from crops like corn, rice, or potatoes into shorter chains of glucose molecules.1PubMed Central. Nutrition, Health, and Regulatory Aspects of Digestible Maltodextrins Human breast milk is rich in lactose, and standard infant formulas mirror that by using lactose as their primary carbohydrate. But not every baby tolerates lactose well, and not every formula type can include it. Specialty formulas designed for conditions like lactose intolerance, gastroesophageal reflux, and gut immaturity in premature infants rely on modified carbohydrate blends that swap some or all of the lactose for alternatives like maltodextrin, corn syrup solids, or sucrose.2Starch – Stärke. Functionality of α‐glucans in special formulas for infant and clinical nutrition
The practical appeal is easy to understand. Maltodextrin dissolves well, has a mild flavor, provides the same calories per gram as lactose, and does not trigger the digestive issues that lactose can cause in babies with an intolerance. It also helps thicken anti-reflux formulas without altering taste too much. For formula manufacturers, it is a versatile and inexpensive ingredient. That versatility, though, has led to maltodextrin turning up in products well beyond the specialty category.
A review of U.S. formula sales found that roughly 59% of all infant formula purchased was lactose-reduced, meaning it contained a non-lactose carbohydrate like maltodextrin or corn syrup solids. Across formulas on the market, the carbohydrate breakdown averaged about 53% lactose, 42% glucose polymers (a category that includes maltodextrin and corn syrup solids), and 5% sucrose.3PubMed Central. Infant consumption of 100% lactose-based and reduced lactose infant formula in the United States: Review of NHANES data from 1999 to 2020 That is a striking number, because true lactose intolerance in infancy is rare. The same review noted that more U.S. infants consume formula with nonlactose carbohydrates than is medically necessary.3PubMed Central. Infant consumption of 100% lactose-based and reduced lactose infant formula in the United States: Review of NHANES data from 1999 to 2020 In other words, many babies end up drinking maltodextrin-containing formula not because they need it, but because their parents chose a “gentle” or “sensitive” label under the impression it would be easier on their baby’s stomach.
How Well Babies Digest Maltodextrin
One worry you sometimes hear is that infants cannot properly break down maltodextrin because their digestive systems are immature. This is an oversimplification. Babies are born with low levels of pancreatic amylase, the enzyme adults primarily rely on to digest starch. But they compensate with other enzymes. Salivary amylase, enzymes present in breast milk itself, and a group of enzymes lining the intestinal wall called glucosidases all pitch in to break glucose chains apart.4Starch – Stärke. The digestion of complementary feeding starches in the young child Research into these intestinal wall enzymes shows that two in particular, sucrase-isomaltase and maltase-glucoamylase, account for about 85% of the conversion of small glucose chains into absorbable glucose. Pancreatic amylase contributes less than 15% of that conversion on its own but amplifies the work of the intestinal enzymes by pre-processing starch into the shorter fragments they can handle.5PubMed. Luminal substrate “brake” on mucosal maltase-glucoamylase activity regulates total rate of starch digestion to glucose
The upshot is that young babies can digest maltodextrin and absorb the glucose it releases, even though their pancreatic amylase levels are low. Rice-derived maltodextrin appears to be particularly easy for infants to digest because of its molecular structure.4Starch – Stärke. The digestion of complementary feeding starches in the young child So the concern is not that babies cannot break the ingredient down. The real questions are about what happens downstream: how the body processes that glucose, what effect it has on gut bacteria, and whether it changes feeding behavior in ways that matter for long-term health.
Effects on Gut Bacteria
This is where the evidence starts to raise genuine flags. Lactose, the sugar naturally found in breast milk, has a well-documented role in supporting Bifidobacteria, the beneficial gut bacteria that dominate a healthy breastfed infant’s microbiome. When you swap lactose for maltodextrin or corn syrup solids, the microbial environment shifts.
A study of Hispanic infants compared three groups at six months of age: breastfed babies, babies fed traditional lactose-based formula, and babies fed a lactose-reduced formula with added corn syrup solids (a close relative of maltodextrin). The babies drinking the lactose-reduced formula had lower levels of Bifidobacteriaceae and higher levels of Lachnospiraceae, a family of bacteria associated with propionate production. The researchers also found higher predicted propionate levels in the guts of babies on the lactose-reduced formula. Perhaps most striking, formula carbohydrate type had a stronger association with the infant’s microbiome composition at six months than birth delivery mode, caloric intake, or maternal weight.6PubMed Central. Lactose-reduced infant formula with added corn syrup solids is associated with a distinct gut microbiota in Hispanic infants
Whether these shifts cause health problems in the short or long term is still an open question. Bifidobacteria are considered protective in early life, playing roles in immune development and crowding out harmful microbes, so seeing them decline is not reassuring. But the study observed an association, not a proven chain of cause and effect, and it looked at corn syrup solids specifically, not purified maltodextrin. The two ingredients are chemically similar but not identical. Still, the finding adds weight to the argument that lactose-based formula should remain the default when there is no medical reason to switch.
Intestinal Barrier Concerns From Animal Research
Separate from the microbiome story, a mouse study raised concerns about maltodextrin’s direct effect on the intestinal lining. Mice fed maltodextrin showed a decrease in mucus-producing cells in the gut, which led to bacteria getting physically closer to the intestinal wall. In laboratory models of intestinal tissue that contained no bacteria or immune cells at all, maltodextrin exposure still reduced the number of goblet cells (the cells that make protective mucus) and lowered mucus production. The researchers linked this to reduced expression of a gene involved in goblet cell development.7PubMed Central. Maltodextrin Consumption Impairs the Intestinal Mucus Barrier and Accelerates Colitis Through Direct Actions on the Epithelium
This finding has gotten a lot of attention in parenting circles, and it is worth understanding its limits. The study was conducted in adult mice, not human infants. The doses, the duration of exposure, and the maturity of the intestinal lining are all very different between a lab mouse and a formula-fed newborn. The result is biologically interesting and suggests a plausible mechanism by which maltodextrin could contribute to gut inflammation, but it is a long way from showing that baby formula containing maltodextrin causes intestinal damage in real infants. Researchers use studies like this to justify further investigation, not to issue dietary warnings.
Weight Gain and Metabolic Concerns
The link between non-lactose formula carbohydrates and childhood weight gain is probably the most worrying area of emerging research for parents. Maltodextrin has a high glycemic index, meaning it raises blood sugar faster than lactose does. When blood sugar spikes quickly, it can overshoot the satiety signals that help babies stop eating when they have had enough. Over time, that pattern could encourage overfeeding and excess fat gain rather than healthy linear growth.
A cohort study tracking infants over their first years of life found that consumption of non-standard formulas, including those with maltodextrin or sucrose replacing lactose, was associated with elevated weight-for-age and BMI scores. The researchers noted that these elevated scores could signal a higher risk of overweight and obesity later in childhood.8Nutrients. Cohort study: Formula for sensitive or intolerant babies linked with elevated BMI A separate review of national survey data echoed this concern, pointing to recent evidence that infant formula made with corn syrup solids may be associated with increased obesity risk in the first five years of life.3PubMed Central. Infant consumption of 100% lactose-based and reduced lactose infant formula in the United States: Review of NHANES data from 1999 to 2020
These findings deserve a dose of caution. Observational studies like these cannot fully disentangle the carbohydrate source from every other variable. Parents who choose “sensitive” formula may already be dealing with fussier babies who feed differently, or they may come from demographic groups with different dietary patterns. The biological mechanism is plausible, the direction of the signal is consistent across studies, but calling it proven would be premature. What the evidence does support is a reasonable suspicion that reaching for a lactose-reduced formula without a clear medical reason might carry metabolic trade-offs.
What About Tooth Decay
Parents familiar with the link between sugar and cavities sometimes wonder whether maltodextrin makes formula more damaging to emerging teeth. The answer, based on available research, is that maltodextrin on its own does not seem to be a major cavity risk. An in situ study tested whether adding maltodextrin to sucrose increased enamel mineral loss compared to sucrose alone. The result was clear: the combination of sucrose and maltodextrin caused the same degree of enamel damage as sucrose by itself. Maltodextrin alone, without sucrose, did not produce significant mineral loss.9Caries Research. Cariogenic Potential of Sucrose Associated with Maltodextrin on Dental Enamel
This makes biological sense. Cavity-causing bacteria in the mouth thrive on simple sugars, especially sucrose. Maltodextrin is a chain of glucose units that oral bacteria are less efficient at fermenting into the acids that erode enamel. So while maltodextrin is not great for teeth in the way that water is, it does not appear to make things worse than the sugars already present in many formulas. If your baby’s formula contains sucrose, that is the ingredient to pay attention to from a dental standpoint, not the maltodextrin.
Taste, Sweetness, and Feeding Behavior
One thing that may surprise parents is that maltodextrin is not sweet, or at least not in the way lactose and sucrose are. Research into taste perception suggests that maltodextrin and other glucose oligomers are detected through a different pathway than the classic sweet-taste receptor used for sugars like sucrose and lactose. Piglets, which share many taste-perception traits with humans, consistently drank less of a maltodextrin-based formula than a lactose-based one when given free choice. The researchers suggested this could be because lactose is perceived as sweeter and more palatable, or because lactose is familiar from the mother’s milk the piglets had been drinking since birth.10The Journal of Nutrition. Lactose and Digestible Maltodextrin in Milk Replacers Differently Affect Energy Metabolism and Substrate Oxidation: A Calorimetric Study in Piglets
For parents, this raises an interesting practical question. If your baby seems to drink less of a maltodextrin-containing formula compared to a lactose-based one, the taste difference could be a factor. On the flip side, a study in human newborns given a 13% maltodextrin solution as a supplement during their first four days of life found no meaningful difference in sucking activity, appetite, or fullness compared to a control group.11PubMed. Maltodextrin in a 13% solution as a supplement in the first 4 days of life in breast-fed mature newborn infants That study looked at a brief supplementation period in breastfed babies, not long-term formula feeding, so the situations are not directly comparable. But it does suggest that maltodextrin in short-term use does not dramatically alter how much newborns want to eat.
The non-sweetness of maltodextrin is sometimes framed as an advantage by formula manufacturers. The argument is that babies raised on less-sweet formula will not develop a preference for sweet tastes. Whether that actually translates to better eating habits later in childhood is speculative, and no long-term trial has tested the claim. It is a reasonable hypothesis, not a proven benefit.
When Maltodextrin Can Cause Problems
For most babies, maltodextrin is well tolerated in the amounts found in infant formula. But there are rare exceptions. A case report in the Italian Journal of Pediatrics described a premature infant with a bile duct condition and cow’s-milk allergy who was given maltodextrin supplements to manage frequent low-blood-sugar episodes. The infant developed severe abdominal distension and painful crises that required hospitalization. Symptoms resolved only after maltodextrin was withdrawn. The authors cautioned that maltodextrin should be used carefully in infants, especially premature ones.12Italian Journal of Pediatrics. Non-syndromic bile duct paucity and non-IgE cow’s milk allergy: a case report of challenging nutritional management and maltodextrin intolerance
A single case report is the weakest form of clinical evidence, and it involved a medically complex baby with multiple underlying conditions. It would be wrong to generalize from this to otherwise healthy formula-fed infants. What it does illustrate is that blanket assumptions about maltodextrin being inert and universally safe deserve some scrutiny, particularly for premature babies whose guts are less mature and more vulnerable to disruption. If your premature infant is on a maltodextrin-containing formula and develops unexplained abdominal symptoms, it is worth mentioning the ingredient to your pediatrician as something to consider.
An Unexpected Finding From Piglet Research
Not all the signals around maltodextrin are negative. A study comparing piglets raised on maltodextrin-based versus lactose-based formula found that the maltodextrin group performed better on a spatial memory task. The piglets fed maltodextrin had higher reference memory scores toward the end of the learning phase, and when the test was rearranged to challenge them, they continued to make fewer errors. The effect persisted even weeks after the dietary intervention ended. Short-term working memory was unaffected.13Nature / Scientific Reports. A milk formula containing maltodextrin, vs. lactose, as main carbohydrate source, improves cognitive performance of piglets in a spatial task
This is a genuinely surprising result, and it sits awkwardly alongside the metabolic and microbiome concerns. The researchers proposed that maltodextrin’s different metabolic pathway, which involves a steadier supply of glucose to the brain compared to lactose’s mix of glucose and galactose, could explain the memory advantage. Piglets are one of the better animal models for infant nutrition because their digestive systems resemble a human baby’s in several important ways, but a piglet memory task is not the same as human cognitive development. No human trial has replicated this finding. It is a data point worth knowing about, especially for parents who feel anxious that choosing a maltodextrin formula has somehow harmed their baby’s brain. The available animal evidence, limited as it is, does not support that worry.
The European Regulatory Contrast
Parents who compare American and European formula labels will notice a significant difference. The European Union restricts the types and amounts of non-lactose carbohydrates that can be used in standard infant formula, generally requiring lactose to be the dominant carbohydrate unless there is a specific medical reason to exclude it. The U.S. FDA, by contrast, requires that infant formula meet nutritional standards but does not mandate lactose as the primary carbohydrate source. This regulatory gap is a big part of why maltodextrin and corn syrup solids are so prevalent in American formulas and much less common in European ones.
Neither system is based on strong evidence of harm from maltodextrin specifically. The EU approach reflects a precautionary philosophy and the principle that formula should resemble breast milk as closely as possible. The U.S. approach gives manufacturers more flexibility, which has the practical benefit of making specialty formulas cheaper and more widely available but the downside of allowing ingredients like maltodextrin to creep into routine products where they may not be needed. For parents importing European formula or choosing between domestic options, the regulatory difference explains much of the ingredient variation they see but does not, on its own, tell them which approach is better for their child.
What the research collectively points toward is a reasonable middle position. When a baby has a genuine medical need for a lactose-reduced or lactose-free formula, maltodextrin is a well-tolerated, digestible alternative that serves a real purpose. When a baby is doing fine on standard lactose-based formula, switching to a “gentle” product with maltodextrin because of mild fussiness or marketing pressure introduces trade-offs in gut bacteria composition and possibly metabolic signaling that have no offsetting benefit. Talking to your pediatrician before making the switch is worth the five-minute conversation.