Vishnupurana 5.6.35

5.6.35

kālena gacchatā tau tu saptavarṣau mahāvraje
sarvasya jagataḥ pālau vatsapālau babhūvatuḥ //

As the two boys, Ráma and Dámodara, grew up, they were ever together in the same place, and engaged in the same boyish sports. They made themselves crests of the peacocks' plumes, and garlands of forest flowers, and musical instruments of leaves and reeds, or played upon the pipes used by the cowherds: their hair was trimmed like the wings of the crow, and they resembled two young princes, portions of the deity of war: they were robust, and they roamed about, always laughing and playing, sometimes with each other, sometimes with other boys; driving along with the young cowherds the calves to pasture. Thus the two guardians of the world were keepers of cattle, until they had attained seven years of age, in the cow-pens of Vrindavan.