Yeah, I think one of the biggest ones, even at your DD's age is telling her what is ok, not what isn't. Children hear the action, so "don't stand", becomes "stand", but "sit down on the chair" gives them an action to do.
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Also, save NO for the big stuff. So much of what we say No to, really is ok. So my rule of thumb is unless I have a very good reason, it's OK. Dumping the blocks might not be awesome fun for me to clean up, but really, I don't say NO to dumping becuase I don't want to clean them up. That's not a good enough reason in my book. Same for pulling DVD cases and such off the shelf... most of that stuff is cause and effect...
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What kind of things are you saying no to? I'm having a hard time picturing at 9 months what would require a NO. Maybe give some examples to have a what to do next time. Dashing off into the street is one of those things that I have said/yelled No about, but the word carries much more weight in my family if they don't hear it for the little stuff.