DHA is one of the key building blocks for fetal development, a period during which DHA rapidly accumulates in specific tissues where it is needed upon birth—the brain, eyes, liver, adipose (fat), and skeletal muscle. Once an infant is born, DHA is important for healthy vision, healthy cognition, and a healthy immune system.* Statistically, mothers with high DHA levels during pregnancy have longer pregnancies and fewer preterm births (<34 weeks). Babies born to these moms tend to have higher birth weights and experience earlier gains in visual and cognitive development.*
While growing, the fetus obtains DHA solely through the mother, so it’s imperative that mom has adequate DHA stores to support not only her baby’s developing needs, but also her own. A developing baby accumulates DHA throughout the pregnancy, especially during the last trimester. From week 35 to week 40, on average, a fetus gains 45% more weight. Over the same period, DHA accumulates as much as 840%! As the fetus ramps up DHA absorption, that same DHA is lost from the mother. If the mother already has low DHA status, then this last-minute demand puts her at risk of DHA insufficiency, which can have serious implications. Low maternal DHA upon birth has been associated with an increased risk of postpartum baby blues or changes in mood.* This is especially problematic for mothers who intend to breastfeed, since DHA insufficiency will be reflected in their milk and, ultimately, could also put the infant at risk for DHA insufficiency.
The good news is that mothers who consume more DHA in just the last few weeks of pregnancy give birth to babies with significantly higher DHA levels. This means that it’s never too late to increase your DHA intake.