Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 10
Sanskrit:
न ते श्रद्दधिरे गोपा बालभाषितमित्युत ।अप्रमेयं बलं तस्य बालकस्य न ते विदु: ॥ १० ॥
ITRANS:
na te śraddadhire gopābāla-bhāṣitam ity utaaprameyaṁ balaṁ tasyabālakasya na te viduḥ
Translation:
The assembled gopīs and gopas, unaware that Kṛṣṇa is always unlimited, could not believe that baby Kṛṣṇa had such inconceivable power. They could not believe the statements of the children, and therefore they neglected these statements as being childish talk.