Long ago our ancestors used to travel visiting relatives on the way. They camped near Wuludi (waterholes or billabongs)
which had Unguds (dreaming totems) in the Ngaboon (water). Sometimes childless couples were travelling and met with relatives, and that relative may dream or hear a Ilala (baby) cry. That relative may give the couple food or presents which are like giving the couple a Ilala (baby) they've longed for. Sometimes it could be in the form of an animal to represent the Ilala's Ungud. Sometimes the couple would go swimming in the Ungud water (sacred water hole that spirits of children originate from), so it could see that the couple wanted a baby, and maybe would give them one.