I remember coming across an interesting language where the first sounds out of a baby's mouth were not considered to be "mother" and "father," but were instead considered to be a curse word. I want to say it was "ke," but I'm not certain. That culture viewed babies as effectively chaotic demons. Parents did not raise their child at first, but it was taken to nearby relatives to be raised until the child was "proper" enough to be introduced to the parents.
I wanted to cite this fascinating language in a debate, but I am having trouble finding it again amidst all the parenting help sites that Google offers when talking about first words or children swearing. But I'm hoping this is a famous enough case that someone can remember which culture and language this was.