My 4 year old DD had been left dominant from the beginning. I remember noticing it very early and commenting on it but was aware that it could change. She never did change preferences and is absolutely a left hander.
Her younger sister on the other hand (almost 2) has always shown preference for her right. She may have tried things more with her left in the early days but will always come back to right handedness.
So for both my girls it has been pretty clear from the beginning.
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