What a Mother Eats in Pregnancy May Shape Baby's Risk of Colic and Eczema

Background

Infant colic (prolonged, unexplained crying) and eczema are common and can signal early allergy risk. Most research has looked at what breastfeeding mothers eat or which formula is used after birth. A new study looks earlier: the mother's diet during pregnancy.

What changed

Researchers from Harvard T.H. Chan School of Public Health, Boston Children's Hospital, and Harvard Pilgrim Health Care Institute analyzed 1,324 mother-child pairs from the Project Viva cohort. Mothers reported diet in the first and second trimesters. Scores measured adherence to a Mediterranean-style pattern (fruits, vegetables, whole grains, healthy fats, seafood) and dietary inflammation.

Key findings, published October 12, 2026 in JAMA Network Open:

Associations were stronger when the mother herself had a history of asthma, hay fever, or eczema.

Competing viewpoints

This is an observational cohort study, not a randomized trial. It shows association, not proof that changing diet will prevent colic or eczema. Residual confounding (other lifestyle factors that travel with diet) remains possible. The cohort is from eastern Massachusetts and may not represent all populations. Some experts note that colic definitions vary and that the combined outcome was relatively rare, so absolute risk reductions are modest.

Still, the pattern aligns with broader evidence that prenatal nutrition influences infant immune and gut development. Medical societies already encourage healthy patterns rich in plants, fiber, and omega-3 sources during pregnancy for other reasons.

What to watch next

Clinicians may start asking about prenatal diet when counseling families with strong atopic history. Larger trials testing Mediterranean-style or seafood-focused interventions in pregnancy could clarify whether the link is causal. Parents can review the original paper and discuss any major diet changes with their obstetrician or midwife, especially regarding fish choices (low-mercury species, appropriate portions).

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