Omega-3 fats are particularly important from the third trimester through the first 18 months of life for development of the brain, retina, and central nervous system. During this time period, the developing fetus accumulates 50 to 70 milligrams of DHA per day,[1] and this process continues to occur through 18 months of age.[2] This is why most studies initiate supplementation during the third trimester. It is generally recommended that fish oil fats are supplemented from the onset of pregnancy,[3] so there’s no need to omit supplementation outside of the third trimester.
Why are omega-3 fats important to take in the third trimester?
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•Last Updated: April 23, 2025
Omega-3 fats are crucial during the third trimester and the first 18 months of life for the development of the brain, retina, and central nervous system; the fetus accumulates significant amounts of DHA daily. Supplementation is generally recommended to start at the onset of pregnancy, not just during the third trimester.