One verse

Srimad Bhagavatam 10.13.18

10.13.18

तत: कृष्णो मुदं कर्तुं तन्मातृणां च कस्य च । उभयायितमात्मानं चक्रे विश्वकृदीश्वर: ॥ १८ ॥

tataḥ kṛṣṇo mudaṁ kartuṁ tan-mātṝṇāṁ ca kasya ca ubhayāyitam ātmānaṁ cakre viśva-kṛd īśvaraḥ

tataḥ
thereafter
kṛṣṇaḥ
the Supreme Personality of Godhead
mudam
pleasure
kartum
to create
tat-mātṝṇām ca
of the mothers of the cowherd boys and calves
kasya ca
and (the pleasure) of Brahmā
ubhayāyitam
expansion, both as the calves and as the cowherd boys
ātmānam
Himself
cakre
did
viśva-kṛt īśvaraḥ
it was not difficult for Him, for He is the creator of the whole cosmic manifestation

Thereafter, just to create pleasure both for Brahmā and for the mothers of the calves and cowherd boys, Kṛṣṇa, the creator of the entire cosmic manifestation, expanded Himself as calves and boys.