This placebo double blind (this means very good) study gave expectant mums "400 mg DHA or placebo from 18–22 wk gestation to parturition[birth]." They analyzed the breast milk at 1 month after baby was born. They found that the supplement group have significantly increased DHA (a good omega 3 fat).
This shows (a) that supplementation of diet with DHA (found in fish oils) increased the DHA that baby can use for its brain development. (b) that the fat metabolism is much longer than that of say a water soluble vitamin. Stopping the supplementation at birth there was still a significant effect on the breast milk composition at day 30. Therefore the DHA was "hanging around" in mum's body for at least 30 days, if not longer
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