Long-Term Neurodevelopmental Challenges Persist in Infants Treated for Vitamin B12 Deficiency Syndrome

September 13, 2026 2 Min Read

Overview of Infantile Vitamin B12 Deficiency Syndrome

Neurocutaneous infantile vitamin B12 deficiency syndrome (NIB), also known as Infantile Tremor Syndrome (ITS), is a neurological condition affecting infants, often linked to low vitamin B12 levels. Although it is a preventable cause of neurodevelopmental impairment, it remains under-recognized in many regions.

Study on Neurodevelopmental Outcomes After Treatment

A recent study conducted at a tertiary care center in North India followed 52 children aged between 3 months and 2 years diagnosed with NIB. These children, all presenting with neurological symptoms and confirmed low serum vitamin B12, were evaluated one year after receiving treatment. Researchers assessed their neurodevelopment using the Developmental Assessment Scale for Indian Children (DASII) and screened for autism risk with the Modified Checklist for Autism in Toddlers (M-CHAT). Serum vitamin B12 levels were also remeasured.

Key Findings

While all children showed biochemical recovery with normalized vitamin B12 levels, neurodevelopmental progress was limited. Only 19.2% of the children achieved a normal motor developmental quotient (DQ), and just 11.5% reached a normal mental DQ. Additionally, 25% of the participants were identified as having a moderate risk for autism based on M-CHAT screening.

Factors Linked to Poorer Outcomes

Very low initial serum vitamin B12 levels
Older age at diagnosis
Prolonged exclusive breastfeeding without supplementation
Severe anemia at presentation
Involvement of cognitive domains at initial assessment
Elevated autism risk

Implications for Families and Healthcare Providers

This study highlights that despite effective biochemical correction of vitamin B12 deficiency, many infants continue to experience significant neurodevelopmental delays. Early identification and intervention are crucial to improving long-term outcomes. Furthermore, ongoing developmental monitoring is recommended for children affected by NIB to address emerging challenges promptly.

Limitations and Considerations

As an ambispective study from a single center, findings may not be generalizable to all populations. The association between prolonged exclusive breastfeeding and poorer outcomes suggests nutritional counseling may play a role in prevention. However, causation cannot be definitively established from this study alone.

For families and clinicians, these results underscore the importance of awareness about vitamin B12 deficiency symptoms in infants and the need for timely nutritional assessment and support.

More detailed information can be found in the original research publication: Neurodevelopmental and vitamin B12 status of patients treated for neurocutaneous infantile vitamin B12 deficiency syndrome: a follow up study.