The Child (te tamaiti) at Cb13-30 could be the result of a kava ceremony 3 quarters earlier (at the beginning of the gestation period).

... Traditionally, remark, the kava root was chewed to make the infusion: The sacrificed child of the people is cannibalized by the young chiefs. The water of the kava, however, has a different symbolic provenance. The classic Cakaudrove kava chant, performed at the Lau installation rites, refers to it as sacred rain water from the heavens ... This male and chiefly water (semen) in the womb of a kava bowl whose feet are called 'breasts' (sucu), and from the front of which, tied to the upper part of an inverted triangle, a sacred cord stretches out toward the chief ... 

The cord is decorated with small white cowries, not only a sign of chieftainship but by name, buli leka, a continuation of the metaphor of birth - buli, 'to form', refers in Fijian procreation theory to the conceptual acception of the male in the body of the woman. The sacrificed child of the people will thus give birth to the chief. But only after the chief, ferocious outside cannibal who consumes the cannibalized victim, has himself been sacrificed by it. For when the ruler drinks the sacred offering, he is in the state of intoxication Fijians call 'dead from' (mateni) or 'dead from kava' (mate ni yaqona), to recover from which is explicitly 'to live' (bula). This accounts for the second cup the chief is alone accorded, the cup of fresh water. The god is immediately revived, brought again to life - in a transformed state ...

In Cb13-30 an element of vaha mea evidently explains this was where rebirth would occur: