mukhaṁ lālayatī rājañ
jṛmbhato dadṛśe idam
dvīpān nagāṁs tad-duhitṝr vanāni
bhūtāni yāni sthira-jaṅgamāni
By the arrangement of Yoga-māyā, Kṛṣṇa’s pastimes with mother Yaśodā were all regarded as ordinary. So here was an opportunity for Kṛṣṇa to show His mother that the whole universe is situated within Him. In His small form, Kṛṣṇa was kind enough to show His mother the virāṭ-rūpa, the universal form, so that she could enjoy seeing what kind of child she had on her lap. The rivers have been mentioned here as the daughters of the mountains (nagāṁs tad-duhitṝḥ). It is the flowing of the rivers that makes big forests possible. There are living entities everywhere, some of them moving and some of them not moving. No place is vacant. This is a special feature of God’s creation.