A 2026 pilot study of 14 infants in India found that undetectable holo-transcobalamin—a marker of active vitamin B12—was strongly associated with tremors in infantile tremor syndrome, suggesting this bioactive form of B12 is a superior indicator of true deficiency compared to regular B12 tests. According to Gram Research analysis, the findings point to maternal nutritional depletion during pregnancy and breastfeeding as the root cause of this condition.
Researchers in India studied a mysterious childhood condition called infantile tremor syndrome that causes shaking, weakness, and developmental delays. According to Gram Research analysis, they found that a specific marker of active vitamin B12 in the blood—called holo-transcobalamin—may be the key to understanding why some affected babies develop tremors while others don’t. The study also revealed that these children have imbalanced fatty acids in their bodies. The findings suggest that mothers’ poor nutrition during pregnancy and breastfeeding may be the root cause of this condition, which primarily affects children in the Indian subcontinent.
Key Statistics
A 2026 pilot study of 14 infants with infantile tremor syndrome found that holo-transcobalamin was undetectable in babies with tremors but present in those without tremors, suggesting it is a critical threshold marker for tremor development.
In the 2026 study of infantile tremor syndrome, severe developmental delays occurred in 71% of babies with tremors (5 out of 7) compared to 57% of those without tremors (4 out of 7), indicating tremors may be associated with more severe developmental problems.
Research from 2026 analyzing 14 infants with infantile tremor syndrome found omega-6 to omega-3 fatty acid ratios of approximately 10:1, compared to the healthy ratio of 2:1 to 4:1, indicating severe fatty acid imbalance in both groups.
A 2026 comparative study of 14 infants found median serum vitamin B12 levels of 188 pg/mL in babies with tremors versus 198 pg/mL in those without tremors, with both groups showing deficiency but holo-transcobalamin being the distinguishing marker.
The Quick Take
- What they studied: Why some babies with infantile tremor syndrome develop shaking while others don’t, focusing on vitamin B12 levels and fatty acids in the blood
- Who participated: 14 infants in India with infantile tremor syndrome—7 with tremors and 7 without tremors. All were anemic and showed signs of poor nutrition
- Key finding: Babies with tremors had undetectable levels of holo-transcobalamin (a marker of active vitamin B12), while those without tremors had slightly higher levels. This suggests holo-transcobalamin may be the critical threshold that determines whether tremors develop
- What it means for you: If you live in regions where this condition occurs, ensuring good nutrition—especially vitamin B12—during pregnancy and breastfeeding may help prevent this condition. However, this is a small pilot study, so larger research is needed before making clinical changes
The Research Details
This was a small pilot study conducted in India from December 2023 to April 2024 with just 14 infants. The researchers divided the babies into two groups: those with infantile tremor syndrome who had tremors (7 babies) and those with the syndrome but without tremors (7 babies). By comparing these two groups, they could identify which blood markers were different between them.
The researchers measured several things in the babies’ blood: complete blood counts, vitamin B12 levels, holo-transcobalamin (the active form of B12), and essential fatty acids (the healthy fats your body needs). They used statistics to compare the groups and see which differences were meaningful.
This approach allowed them to identify which nutritional factors might be most important for tremor development, treating the presence or absence of tremors as a clue to understanding the underlying cause.
By comparing babies with and without tremors, researchers can identify the specific nutritional threshold that triggers symptoms. This is important because it helps doctors understand which nutrient deficiency is most critical to prevent or treat. Testing holo-transcobalamin instead of regular vitamin B12 is significant because holo-transcobalamin measures the form of B12 your body can actually use, making it a more accurate indicator of true deficiency.
This is a very small pilot study with only 14 participants, which limits how much we can trust the findings. The small sample size means results could be due to chance rather than real differences. However, pilot studies are designed to explore new ideas and generate hypotheses for larger future studies. The findings are interesting enough to warrant bigger research, but shouldn’t be considered definitive proof. The study was conducted at a medical college with proper laboratory methods, which adds credibility to the measurements taken.
What the Results Show
The most striking finding was that holo-transcobalamin was undetectable in babies with tremors but present (though still low) in babies without tremors. This suggests that holo-transcobalamin may be the critical marker that determines whether tremors develop—it appears to be a better indicator of true vitamin B12 deficiency than regular B12 blood tests.
Both groups of babies were anemic (had low red blood cell counts) and had low vitamin B12 levels overall. Group 1 (with tremors) had a median B12 level of 188 pg/mL, while Group 2 (without tremors) had 198 pg/mL—a small difference that wasn’t statistically significant. However, the undetectable holo-transcobalamin in the tremor group was a clear distinction.
Severe developmental delays were more common in babies with tremors (5 out of 7) compared to those without tremors (4 out of 7 had only mild to moderate delays). This suggests tremors may be associated with more severe overall developmental problems.
Both groups showed imbalanced fatty acids in their blood. They had very low omega-3 fatty acids, high saturated fatty acids, and an omega-6 to omega-3 ratio of approximately 10:1 (healthy ratios are typically 2:1 to 4:1). However, these fatty acid imbalances were present in both groups—those with and without tremors—suggesting they’re part of the overall nutritional problem but not specifically what causes tremors. The differences between groups in fatty acid levels were small and not statistically significant.
Previous research suspected vitamin B12 deficiency caused infantile tremor syndrome, but this study provides new insight by showing that holo-transcobalamin (the active, usable form) may be more important than total B12 levels. This is consistent with modern understanding that measuring bioactive nutrients is more accurate than measuring total nutrient levels. The finding that maternal nutrition during pregnancy and lactation is the root cause aligns with what researchers know about how B12 deficiency develops in infants in resource-limited settings.
The biggest limitation is the very small sample size of only 14 babies, which makes it impossible to draw firm conclusions. With such small numbers, random variation can make results look more meaningful than they are. The study was also conducted in one location in India, so findings may not apply to other regions or populations. The study is described as a pilot study, meaning it’s designed to explore ideas rather than provide definitive answers. The researchers couldn’t measure some things precisely due to the small sample, as shown by confidence intervals that crossed zero (meaning the difference could be zero). Finally, this is a cross-sectional study (a snapshot in time) rather than following babies over time, so we can’t determine cause and effect with certainty.
The Bottom Line
For healthcare providers in regions where infantile tremor syndrome occurs: Consider measuring holo-transcobalamin in addition to regular B12 levels, as it appears to be a more specific marker of deficiency. For pregnant women and nursing mothers in at-risk areas: Ensure adequate vitamin B12 intake through diet or supplementation. The evidence is moderate because this is a small pilot study, but the findings are promising enough to warrant attention. Larger studies are needed before making major clinical changes.
Healthcare providers and public health officials in the Indian subcontinent and similar regions where infantile tremor syndrome occurs should pay attention to these findings. Pregnant women and nursing mothers in these areas should ensure adequate nutrition. Parents of infants showing tremors, anemia, or developmental delays should discuss these findings with their doctors. This research is less relevant for people in well-nourished populations where this syndrome is rare.
If nutritional interventions are implemented based on these findings, improvements in tremors and development would likely take weeks to months to become apparent, as the body needs time to rebuild nutrient stores and repair neurological damage. Prevention through maternal nutrition during pregnancy would be most effective, with benefits appearing in the child’s health from birth onward.
Frequently Asked Questions
What is infantile tremor syndrome and where does it occur?
Infantile tremor syndrome is a childhood condition causing tremors, weakness, anemia, and developmental delays. It primarily affects infants in the Indian subcontinent and appears linked to severe maternal nutritional deficiency, particularly vitamin B12 deficiency, during pregnancy and breastfeeding.
Why is holo-transcobalamin better than regular B12 tests?
Holo-transcobalamin measures the form of vitamin B12 your body can actually use, while regular B12 tests measure total B12 including inactive forms. A 2026 study found holo-transcobalamin was undetectable in babies with tremors, making it a more accurate marker of true deficiency.
Can maternal nutrition during pregnancy prevent infantile tremor syndrome?
Research suggests maternal nutritional depletion during pregnancy and lactation causes infantile tremor syndrome. Ensuring adequate B12 intake through diet or supplements during pregnancy and breastfeeding may help prevent the condition, though larger studies are needed to confirm this.
What fatty acid imbalances were found in babies with this condition?
A 2026 study found infants with infantile tremor syndrome had very low omega-3 fatty acids, high saturated fatty acids, and omega-6 to omega-3 ratios of approximately 10:1 (healthy is 2:1 to 4:1). These imbalances appeared in both babies with and without tremors.
How reliable are these findings for making treatment decisions?
This is a small pilot study with only 14 infants, so findings are preliminary and shouldn’t guide clinical decisions alone. The results are interesting enough to warrant larger research, but doctors should wait for bigger studies before making major changes to treatment approaches.
Want to Apply This Research?
- Track maternal B12 intake (micrograms per day) and infant developmental milestones monthly, noting any tremors or muscle weakness. Compare against recommended intake of 2.4 mcg daily for adults and 0.4-0.5 mcg for infants
- Users in at-risk regions should set reminders to consume B12-rich foods daily (eggs, dairy, fortified cereals, meat) or take supplements as recommended by their healthcare provider. Log weekly B12 food sources and supplement doses
- Monthly check-ins on infant development, muscle tone, and tremor presence. Quarterly blood work if available to track B12 and holo-transcobalamin levels. Long-term tracking of growth and developmental milestones against age-appropriate standards
This research is a small pilot study with only 14 participants and should not be used as the sole basis for medical decisions. Infantile tremor syndrome is a serious condition requiring professional medical evaluation and treatment. If your infant shows tremors, weakness, developmental delays, or anemia, consult a pediatrician immediately. Nutritional supplementation during pregnancy and breastfeeding should only be undertaken under medical supervision. This article is for educational purposes and does not replace professional medical advice.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.