Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 59
Sanskrit:
एवं विहारै: कौमारै: कौमारं जहतुर्व्रजे ।निलायनै: सेतुबन्धैर्मर्कटोत्प्लवनादिभि: ॥ ५९ ॥
ITRANS:
evaṁ vihāraiḥ kaumāraiḥkaumāraṁ jahatur vrajenilāyanaiḥ setu-bandhairmarkaṭotplavanādibhiḥ
Translation:
In this way Kṛṣṇa and Balarāma passed Their childhood age in Vrajabhūmi by engaging in activities of childish play, such as playing hide-and-seek, constructing a make-believe bridge on the ocean, and jumping here and there like monkeys.