Expectant mothers who eat enough omega-3 fats late in pregnancy may give their babies a brain-power boost. Researchers found that among 109 Inuit infants they followed, those whose umbilical-cord blood was higher in docosahexaenoic acid, an omega-3 acid, at birth did better in tests of infant brain and eye development at the ages of 6 and 11 months. Because of the fat's vital role in brain development, experts have recommended that pregnant women get an average of 300 milligrams of DHA daily. The new findings, reported in the Journal of Pediatrics, highlight the particular importance of DHA in the mothers' diet during the third trimester, when fetal brain development accelerates. Pregnant and breast-feeding women are advised to avoid some fish, however, due to potentially high levels of mercury. These include shark, swordfish, king mackerel and tile fish.