kungaba netimbangela letahlukahlukene letifanana nekulimala enhloko, lokungenteka nome ngabe ungakanani ngebudzala, kulimala nawubelekwa, njengekweswelakala kwemoyamphilo ngesikhatsi ubelekwa; kuchucha kwemkhuhlane, kuvuvuka kwebucopho incubulundvwana yasebuntfwaneni; kanye nekutsikameteka nome kungalingani kwenchubo yekusebenta kwemtimba nome yemakhemikhali emtimba.

kukho iintlobo ezahlukeneyo ezibangelwa kukonzakala engqondweni, oko kunokwenzeka nakweyiphi na iminyaka; ukonzakala ekuzalweni, kufana nokunqongophala kweoksijini ngexesha lokuzalwa; ukuxhuzula ngenxa yomkhuhlane, ukudumba kobuchopho okwenziwa lusuleleko, ukudumba kwenwebu yobuchopho okanye imasisi yabantwana; kunye nokuphazamiseka okanye ukungalingani komzimba okanye kwamakhemikhali emzimbeni.
