Methods for enhancing cognitive ability in infants are shown. The methods comprise feeding infants baby-food compositions containing docosahexaenoic acid (DHA) in an amount of at least about 0.5 mg per gram of the composition. Infants fed a composition containing DHA from an age of about 6 months to about one year exhibit improved problem solving ability compared to infants fed a composition containing DHA in an amount less than about 5 mg per 100 grams total composition over the same period. The source of the DHA can be DHA-enriched coagulated egg yolk solids present in an amount of from about 5% to about 25% (grams/100 grams). Also shown are methods of making the DHA-enriched baby-food compositions, and methods of providing the compositions to a consumer.