First hair of a baby, one entering puberty.
Un ibu' han būu' nen eppola' ti pa'ittūngaw at un uwāni tumubūan di būu'na.
The hair of that infant is just first hair because she is newly born and so it will be later when her hair will issue new growth.
For a baby, the body, the pubic area, abūngal (actor -um-), to begin developing hair.