Research reviewed by Gram found that taking 250 micrograms of vitamin B12 daily during pregnancy, compared with 50 micrograms, was linked to slightly better language development in babies at 9 to 12 months. The gap was about 2.8 quotient points in a trial of 531 mother-infant pairs. Researchers call the effect small and preliminary.
According to research reviewed by Gram, pregnant women who took a higher daily dose of vitamin B12 had babies with slightly better early language skills at 9 to 12 months. In a randomized trial of 531 mother-infant pairs in India and Nepal, mothers took either 250 micrograms or 50 micrograms of vitamin B12 per day. Babies whose mothers took the higher dose scored about 2.8 points higher on language measures, a small difference. Motor skills and thinking-related skills showed no clear difference between the groups. The researchers describe this as an exploratory analysis, so the finding is a lead rather than proof. Its real-world importance is not yet clear. Pregnant women should talk with their doctor before changing any vitamin dose.
Key Statistics
A 2026 secondary analysis of a randomized controlled trial with 531 mother-infant pairs in India and Nepal found that babies whose mothers took 250 micrograms of vitamin B12 daily scored 2.80 quotient points higher on language skills than babies whose mothers took 50 micrograms.
In the same 2026 analysis, the language difference was the only outcome to pass strict false-discovery checks (q=0.006), while motor skills and combined thinking skills showed no clear differences between the two dose groups.
The Quick Take
- What they studied: Researchers wanted to know whether a higher dose of vitamin B12 during pregnancy affects which early childhood skills improve, such as language, movement, or thinking.
- Who participated: The study included 531 mothers and their babies, recruited at two maternity hospitals, one in New Delhi, India, and one in Kathmandu, Nepal. Babies were checked at 9 to 12 months of age.
- Key finding: Babies whose mothers took 250 micrograms of vitamin B12 daily scored about 2.8 points higher on language skills than babies whose mothers took 50 micrograms. On this scale, 100 is the average for a child’s age, so the gap is small.
- What it means for you: The language difference is interesting but preliminary. It does not prove that a higher vitamin B12 dose helps babies learn to talk. Pregnant women should follow their doctor’s advice on vitamin B12 and not change their dose based on this study alone.
The Research Details
This study was a secondary analysis, meaning researchers took data from an earlier clinical trial and looked at it in a new way. The original trial, called MATCOBIND, randomly assigned pregnant women to take either a higher or a lower daily dose of vitamin B12. Random assignment means chance decided which group each woman joined, which helps make the groups similar at the start.
Neither the mothers nor the researchers who assessed the babies knew which dose each woman had taken. This is called double-blinding, and it reduces the chance that expectations could shape the results. When the babies were 9 to 12 months old, trained staff used a standard test called the Developmental Assessment Scale for Indian Infants. The test checks several areas of development, including movement, language, and thinking.
Because the test measures many skills, the researchers looked at each area separately and also at combined groups. They adjusted their statistics to account for the fact that checking many areas at once raises the chance of finding a difference by accident.
A randomized design is one of the strongest ways to test whether one factor causes a change. Because the women were assigned to doses by chance, differences between the groups are more likely to come from the vitamin dose itself rather than from other factors like diet or income.
The double-blind design also makes the results more trustworthy. If the people judging the babies had known the dose, they might have scored them differently without meaning to.
Secondary analyses like this one are useful for generating ideas, but they are not as strong as a trial designed from the start to test a specific question. The researchers themselves labeled this work exploratory, which means it should guide future studies rather than settle the question.
The study has several strengths. It was a randomized, double-blind trial with a reasonably large group of 531 mother-infant pairs. The results were similar across the two hospital sites, and they held up after accounting for families who did not complete follow-up visits.
There are also important cautions. This was a secondary analysis, and the subgroup findings were not designed in advance as the main question. After correcting for testing many outcomes, only the combined language result stayed statistically significant, and the individual language areas did not. The authors also note that the measures used are derived scores rather than fully validated subscales, which means they may not capture development as precisely as established tools.
What the Results Show
The main result was in language development. Babies in the higher-dose group scored an average of 2.80 points higher on the language score, with a likely range of 0.95 to 4.65 points. The score is a quotient, which compares a child’s skill level with what is typical for their age, so 100 represents the average.
The language result was the only outcome that passed the researchers’ strict check for false positives. They applied this check using two different ways of presenting the same data, and the language finding held up both times. This makes it more likely to reflect a real pattern, though not certain.
On the other hand, the individual language areas on their own did not pass the same check, so the overall language finding is stronger than any single part of it. Motor skills, the combined thinking-related group, and the remaining mental development areas showed no clear difference between the two dose groups.
The researchers checked whether the results differed between the two hospital sites, and they did not. This suggests the language pattern was not caused by one location or one group of families. The findings also stayed similar after the researchers adjusted for babies who were lost to follow-up, which reduces concern that missing data changed the outcome.
The lack of difference in motor and thinking skills is also worth noting. It suggests that any benefit from the higher dose, if real, may be specific to language rather than spread across all areas of early development.
The original MATCOBIND trial found that babies whose mothers took the higher vitamin B12 dose had higher overall mental development scores at 9 to 12 months. This new analysis helps explain where that overall difference came from, pointing to language as the main area involved.
Vitamin B12 is known to play a key role in nerve development and brain function, so a link to early development makes biological sense. However, earlier research on prenatal vitamin B12 and child development has produced mixed results, and this study adds one more piece rather than settling the question.
This study has several limits that readers should keep in mind. First, it was a secondary analysis, so the language finding was not the original main question of the trial. Second, once the researchers adjusted for testing many outcomes, the individual language areas did not show clear differences, which makes the result less certain.
Third, the test used to measure development relied on derived scores rather than fully validated subscales. This means the measurement tool may not be as precise as the best available tools. Fourth, the researchers say the size of the effect is small, and it is not yet known whether a 2.8-point gap makes any real difference in a child’s daily life or later school performance.
Finally, the study followed babies only up to 9 to 12 months. It does not show whether any language benefit lasts into the toddler or school years.
The Bottom Line
Based on this single exploratory analysis, the evidence is preliminary, so no firm recommendation can be made to change vitamin B12 dosing in pregnancy. Research shows that the language difference was small and passed strict statistical checks only when language was combined into one group. Confidence in the language finding is moderate, while confidence in any practical benefit is low. Pregnant women should continue to follow their doctor’s guidance on prenatal vitamins and vitamin B12 needs. Larger trials designed specifically to test language outcomes are needed before stronger advice can be given.
Pregnant women, parents, and healthcare providers who are interested in prenatal nutrition and early child development may find this research useful. Clinicians who manage pregnancies in places where vitamin B12 deficiency is common may want to follow future studies closely.
People who are not pregnant or planning a pregnancy have little reason to apply these findings directly. Anyone with a known vitamin B12 deficiency should follow medical advice about treatment, whatever the findings of this study.
This study measured babies at 9 to 12 months, so any effect observed here is a snapshot of early development. Vitamin B12 levels during pregnancy would have affected the baby’s development during pregnancy and the first year of life. Whether a difference like this would matter for school readiness or later learning is unknown and would require long-term follow-up studies that have not yet been done.
Frequently Asked Questions
Does taking more vitamin B12 during pregnancy help a baby’s language development?
A 2026 trial of 531 mother-infant pairs found that a 250 microgram daily dose was linked to a 2.8-point higher language quotient at 9 to 12 months than a 50 microgram dose. Researchers describe the effect as small and exploratory, so it is not yet proven to improve real-world language skills.
How much vitamin B12 did pregnant women take in the study?
Participants took either 250 micrograms or 50 micrograms of vitamin B12 per day throughout the trial. The study was conducted at two maternity centers, one in New Delhi, India, and one in Kathmandu, Nepal, with the babies assessed at 9 to 12 months of age.
Did vitamin B12 affect motor skills or thinking skills in babies?
The study found no clear difference in motor skills or combined cognition scores between the two vitamin B12 dose groups. Only the language area showed a difference that held up after statistical correction, so the effect appears limited to language rather than all areas of development.
Should pregnant women change their vitamin B12 dose after reading this study?
Pregnant women should not change their vitamin B12 dose based on this single exploratory study. Doses should be guided by a healthcare provider, who can consider individual needs, blood levels, and the full body of evidence on prenatal supplementation.
Want to Apply This Research?
- Users who are pregnant and taking a prescribed vitamin B12 or prenatal supplement can log their daily dose in milligrams or micrograms, along with the date and any missed doses. Tracking consistency for a full week at a time makes it easier to review adherence with a doctor.
- Set a daily reminder to take a prenatal vitamin at the same time each day, such as with breakfast. Add the dose to a medication or supplement list in the app so it is always visible during doctor visits. Pregnant users should check with their healthcare provider before changing any dose.
- Over the course of pregnancy, users can record their supplement schedule, any symptoms reported to their provider, and questions to bring to appointments. After birth, parents can log developmental milestones such as first words and simple phrases, using their pediatrician’s checklists as a guide. Share these logs with the child’s doctor to support regular developmental screening rather than as a substitute for it.
This article summarizes a secondary analysis of a clinical trial and is for general information only. It is not medical advice. The study was exploratory, its results are preliminary, and it does not establish that any vitamin dose improves a child’s development. Pregnant women and anyone considering a change in vitamin B12 or other supplements should consult a qualified healthcare provider before making changes.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.