Infant Growth: Plant-Based vs. Omnivore Diets

by Grace Chen

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vegan Infants Show Similar Growth to Omnivores, Study Finds

A new study published February 5, 2026, in JAMA Network Open offers reassuring evidence that infants raised in vegan households exhibit growth patterns comparable to those in omnivorous households, though with a slightly elevated risk of being underweight in early infancy.

Researchers conducted a cohort study examining the growth trajectories of infants from different dietary backgrounds. The findings indicate that while vegan infants may have a higher likelihood of being underweight initially,this difference diminishes substantially by the age of 24 months. This observation is especially relevant in the context of developed countries, where access to diverse food options and nutritional resources is generally higher.

Pro tip – Infants require sufficient iron, vitamin B12, and omega-3 fatty acids for healthy growth. Plant-based sources or supplementation may be necessary for vegan infants.

early Underweight Risk Decreases with Age

The study revealed a nuanced picture of infant development. While a higher proportion of infants in vegan households were initially classified as underweight, this disparity lessened considerably as they grew. “The initial difference in weight appears to be a temporary phenomenon,” a senior researcher noted. “By two years of age,the growth patterns between the two groups were largely indistinguishable.”

This suggests that with careful attention to nutritional needs, a vegan diet can adequately support healthy infant growth. However, the research team emphasizes the importance of ongoing monitoring and support.

Reader question – Cohort studies follow groups over time, observing outcomes without direct intervention. This design helps identify associations, but doesn’t prove causation.

The Need for Nutritional Guidance

The authors highlight the critical role of nutritional counseling for pregnant individuals and new parents choosing a vegan lifestyle. Ensuring adequate intake of essential nutrients – particularly iron, vitamin B12, and omega-3 fatty acids – is paramount for optimal infant development.

Further research is needed to assess the impact of vegan diet quality on infant health outcomes. Factors such as the variety of plant-based foods consumed and the use of fortified products could play a significant role.

Did you know?JAMA Network Open publishes research immediately upon acceptance, providing rapid dissemination of medical findings to the public.

Access to the Full Study

Readers can access the complete, peer-reviewed article, including detailed methodology and data analysis, through this link: https://jamanetwork.com/journals/jamanetworkopen/fullarticle/10.1001/jamanetworkopen.2025.57798?guestAccessKey=1b34668e-afe8-4888-aa3d-dd05b3b83eff&utm_source=for_the_media&utm_medium=referral&utm_campaign=ftm_links&utm_content=tfl&utm_term=020526

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