DHA levels may also affect the ability to regulate brain cell membrane proteins, which are critical for neuronal function. DHA is essential for normal neurodevelopment of the growing fetus and infant. Our bodies are able to produce some DHA from other omega-3 precursors, but we can only convert a fraction of what is needed for optimal brain health, especially for brain development. Scientists point to DHA as one of the reasons breastfed children tend to have higher IQ scores and better vision than formula-fed children. The evidence is so strong that infant formula manufacturers have begun adding DHA to their products. The Role of DHA in Mental Health and Aging It is important to get enough DHA during and after pregnancy. Scientists point to DHA as one of the reasons breastfed children tend to have higher IQ scores and better vision than formula-fed children. Role of DHA in mental health and aging. Scientists point to DHA as one of the reasons breastfed children tend to have higher IQ scores and better vision than formula-fed children.