In one study funded by the National Institute of Child Health and Human Development, babies fed Enfamil LIPIL scored 7 points better on a test of mental development (on a 100 point scale), and the equivalent of 1 line better on an eye chart (on a vision test). This formula contains the amount of DHA and ARA recommended by the World Health Organization.
Other studies of DHA and ARA, though, have failed to find a difference, muddying the waters. Comparing these apparently contradictory studies is like comparing apples and oranges; they use different amounts of DHA and ARA, different sources of these nutrients, and different tests to look for differences.
The bottom line for parents?
Just because a product says it contains DHA and ARA does not mean that it contains them in the amounts that have been clinically demonstrated to make a real difference for kids.