1. What is DHA? 2. Do babies need DHA? 3. When should you start supplementing DHA to your baby? 4. How to supplement DHA for babies? 5. Precautions for DHA 6. Conclusion 1. What is DHA? DHA, or docosahexaenoic acid, is an omega-3 polyunsaturated fatty acid. In the human body, DHA mainly exists in the brain and retina, which is important for the intelligence of infants and young children.