The hymn describes rather than narrates. The Child of the Waters lies where the rivers gather, ringed by the Waters, who are young women that deck and feed him. He shines with no wood, wrapped in ghee, golden in every way, and he made all things. He rises into the cloud dressed in lightning. Yet he is also kindled here, and the singer polishes and feeds him as a fire; the closing verse calls him Agni.
Aitareya Brahmana 2.20 and Kaushitaki Brahmana 12.1-2, with Rigveda 10.30
Pan-IndiaAll traditions
At the Soma sacrifice the Adhvaryu goes to the water and makes a libation there; the hymn recited tells the priests to worship the Waters' Child, who shines without fuel and will give a consecrated wave. The Hotri asks whether the Adhvaryu has found the Waters, which the Brahmana glosses as finding the sacrifice, rises to meet them as one meets a superior, and follows them reciting. The Aitareya adds that the water drawn the day before and the water drawn in the morning quarrelled over which should carry the sacrifice first, and Bhrigu reconciled them with a verse of the hymn to the Child of the Waters. The Waters are finally seated on the grass together with their Child.
What is different here:
Ritual, not vision: the god is the receiver of a libation at the water. Adds the quarrel of the two waters and Bhrigu, which the hymn does not have.
Sources: Hymns of the Rigveda, tr. R. T. H. Griffith (1896), hymns read for the Vedic layer; Rigveda Brahmanas: the Aitareya and Kausitaki Brahmanas, tr. A. B. Keith (1920)