"It is unpleasant to have anyone passionately disagree with you. When this opposition comes from your own little delight, the situation is decidedly disagreeable. Many people call this important phase of development the "Terrible Twos." I prefer to call it "The First Adolescence." This period begins long before age two and actually continues long afterwards, but in the majority of children, it is most intensely focused around the period from one-and-a-half to three years of age." http://www.drgreene.com/qa/terrible-twos

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