Scooby wrote:
For me, it's about balance - I never taught my kids (or should I say offspring / progeny?!) to say the likes of 'choo-choo' for 'train' because they were perfectly capable of learning the proper word.
Although children are capable of understanding the "proper" word, they don't have all the phonemes to use them themselves for the first year or so. It can actually become a source of frustration for them when adults expect them to use normal words, let alone difficult ones, before they are ready for them.
In fact, we knew our first daughter could understand us long before she could make any word-like sounds so we taught her a few easy signs (i.e., sign language) to express herself and relieve the frustration she was feeling until her vocal chords caught up.
Japanese also has these "baby words". The concept of "baby words" is pretty well universal, so we taught them all of the baby words in both languages so they would have phonetically easy words to express themselves with.
When they knew and could use geegee, baabaa, and moomoo, I introduced them to the ordinary word equivalents "horse" and "sheep" and "cow", and they learned an important concept from the process, i.e., that there can be more than one correct word to describe any given thing.
I don't dumb down my speech to my kids but I also wouldn't deprive them of important tools they can use to express themselves in a way they feel comfortable with. To me, THAT is balance. (But of course, there is more than one "correct" way to raise children.)
And yes, Saoirse, they know how to say piss and shit in several different ways in both Japanese and English.
(The interesting thing about the American aversion to the word "toilet" is that "toilet" itself is in fact a euphemism. The term comes from the French
(faire la) toilette "to have a wash/groom oneself". )