Ridiculously over-complicated sentences

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Does anyone else find themselves talking to babies in really complicated sentence structures? Yesterday, I caught myself using 'in order that' and 'viz.' in one sentence when describing the process of hanging out the washing to dd

BTW, misuse & overuse of reflexive pronouns really bugs me too, so as I was clearly heading that way in this post, I feel it may be time to stop typing and get a life!

My four year old has an amazing vocab that can only be attributed to us having used long words when she was a baby. I think babies pick up meanings of all words not just the random noun or verb....and she was talking in sentences about six months too early!

I've always used proper sentences and words with DD (4)and she speaks the same way (she told me last week she likes yolk but not albumen).

I've had discussions about this on here in the past. I have no background in how children learn to talk but I can't see how using what are considered to be more "difficult" words makes any difference to the child.
If I always use a more esoteric word (can't think of an example just at the moment) rather than a simple one provided it doesn't have 3 times as many syllables my DC will learn it just like any other word, he doesn't know that everyone else will think its posh/pretentious or whatever.
Pollymere and Plumm are right, the children will speak as the parents do, both for good and bad.