Maternal supplementation with very-long-chain n-3 fatty acids during pregnancy and lactation augments children's IQ at 4 years of age.

By I. Helland, Lars Smith, K. Saarem, O. Saugstad, C. Drevon. Pediatrics, 2003

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Cognitive Enhancement: Methods, Ethics, Regulatory Challenges (2009, positive): “Supplementation of a mother’s diet during late pregnancy and 3 months postpartum with long chained fatty acids has also been shown to improve cognitive performance in human children (Helland et al. 2003).”
The health benefits of omega-3 polyunsaturated fatty acids: a review of the evidence. (2004, background): “However, Helland et al. (2003) did find a relationship between n-3 PUFA and infant IQ.”
The environment in raising early intelligence: A meta-analysis of the fadeout effect (2015, background): “The most telling example is as follows: Supplementing fetuses in a double-blind way with long-chain polyunsaturated fatty acids causes them to have higher IQs by the time they are about four years old (Helland et al., 2003).”
Mechanisms of action of (n-3) fatty acids. (2012, background): “Very long-chain (n-3) fatty acids may contribute to enhanced mental development (28) and improved childhood learning and behavior (29) and may lower the burden of psychiatric illnesses in adults (30).”