Sometimes Mother Yasoda used to ask Krsna to bring her a wooden plank for sitting. Although the wooden plank was too heavy to be carried by a child, still somehow or other Krsna would bring it to His mother. Sometimes His father, while worshiping Narayana, would ask Him to bring his wooden slippers, and Krsna, with great difficulty, would put the slippers on His head and bring them to His father. When He was asked to lift some heavy article and was unable to lift it, He would simply move His arms. In this way, daily, at every moment, He was the reservoir of all pleasure for His parents. The Lord was exhibiting such childish dealings with the inhabitants of Vrndavana because He wanted to show the great philosophers and sages searching after the Absolute Truth how the Supreme Absolute Truth Personality of Godhead is controlled by and subject to the desires of His pure devotees.
From Srila Prabhupada’s Krsna book ch. 11: Killing the Demons Vatsasura and Bakasura