Boy is related to Sex. Baby is created by Sex. Baby is related to Step. Step is related to Height. 
Youth is etymologically related to Young. Young is a type of Animal. Animal is related to Consciousness. Awareness requires Consciousness. 
Boy <--RelatedTo--> Sex <--CreatedBy-- Baby <--RelatedTo--> Step <--RelatedTo--> Height 
Youth --EtymologicallyRelatedTo--> Young --IsA--> Animal <--RelatedTo--> Consciousness <--HasPrerequisite-- Awareness 