25 Feb 2019 Blackmores Institute Fish oil increases birth weight 25 Feb 2019 Share Share on LinkedIn Share on Facebook Share on Twitter Share on Google+ Share on Pinterest News Supplementing pregnant women with omega-3 fatty acids during the third trimester may increase birth weight and gestational age, potentially leading to better outcomes for the infant according to research published in the Journal of Nutrition. × To continue reading this article, please Log In or Sign Up for access.