Low vitamin B12 in pregnancy may affect baby brain

Summary: Higher vitamin B12 intake during pregnancy may boost early brain development in babies, making it a simple and cost-effective step toward better long-term health outcomes.

A new study suggests that higher vitamin B12 intake during pregnancy may boost early brain development in babies, especially among vegetarian mothers. The findings are particularly relevant for South Asia, where vitamin B12 deficiency is common and often overlooked during prenatal care.

Why vitamin B12 matters in pregnancy

Vitamin B12 plays a key role in the formation of the brain and nervous system. During pregnancy, a mother’s nutritional status directly affects the baby’s development.

However, many women, especially those following vegetarian diets, may not get enough vitamin B12 because it is mainly found in animal-based foods.

As a result, deficiency during pregnancy has been linked to:

Delayed brain development in infants
Poor pregnancy outcomes
Long-term cognitive challenges in children

Despite this, routine prenatal care in many regions still focuses mainly on iron and folic acid, leaving vitamin B12 under-addressed.

About the study

Researchers from India, Nepal, and the United Kingdom conducted a carefully designed clinical trial to better understand this issue. The study included vegetarian women in early pregnancy.

Participants were divided into two groups:

One group received a higher dose of vitamin B12 (250 micrograms daily)
The other group received a lower dose (50 micrograms daily)

Supplementation began in the first trimester and continued until six months after delivery.

In total, 531 mother and baby pairs were followed and assessed.

Key findings

The results showed clear benefits of higher supplementation:

Improved maternal vitamin levels: Women who took the higher dose showed a significant improvement in vitamin B12 levels. In fact, deficiency rates dropped by more than 30 per cent compared to the lower dose group.
Better early cognitive development in babies: Importantly, higher vitamin B12 intake during pregnancy may boost early brain development in babies, as infants in the higher dose group scored better in mental development tests at 9 to 12 months of age.
No difference in motor skills: Motor development, such as movement and coordination, remained similar in both groups.

Why these findings matter

Although the improvement in cognitive scores was modest, even small gains at an early age can have meaningful long-term effects. These may include:

Better learning ability
Improved school performance
Stronger overall development

Therefore, higher vitamin B12 intake during pregnancy may boost early brain development in babies at a population level, especially in regions where deficiency is widespread.

A gap in current prenatal care

The study also highlights an important public health gap. Many women enter pregnancy with an undiagnosed vitamin B12 deficiency. Yet, routine antenatal guidelines in India do not currently recommend regular vitamin B12 supplementation.
This is concerning because early pregnancy is a critical window for brain development, and nutritional deficiencies during this period can have lasting effects.

What this means for expectant mothers

For pregnant women, especially those on vegetarian diets, ensuring adequate vitamin B12 intake is essential. Doctors may recommend:

Dietary assessment
Vitamin B12 supplements, when needed
Early screening for deficiency

At the same time, healthcare systems may need to reconsider current guidelines and include vitamin B12 as a standard part of prenatal nutrition.

Conclusion

This study provides practical and actionable evidence. Simply improving maternal nutrition through appropriate supplementation could support healthier brain development in babies.

Source: Inputs from various media Sources

Priya Bairagi

Copy-Writer & Content Editor

All Posts

I’m a pharmacist with a strong background in health sciences. I hold a BSc from Delhi University and a pharmacy degree from PDM University. I write articles and daily health news while interviewing doctors to bring you the latest insights. In my free time, you’ll find me at the gym or lost in a sci-fi novel.