Cod liver oil is the perfect nutritional supplement for growing infants and children. ChildLife Essentials Cod Liver Oil is even better with a strawberry flavor that they will enjoy. DHA. 60% of the brain grows from, develops from and is comprised of fats and oils. Of these, 50% is just one fatty acid: DHA. Nervous System, Eyes and Bones. DHA is particularly abundant in the nervous system and can help support healthy nervous system function and development. In addition to DHA, cod liver oil contains the omega 3 fatty acid EPA that is important for healthy bone development in children. Purified and Tested. When it comes to the best cod liver oil for kids, it is critical that the product be purified and free of detectable levels of toxins. ChildLife uses the finest purification methods available, such as molecular distillation, to safely remove toxins without compromising on quality.