This Article follows the development of an infant over the important period aged 15 – 18 months. It charts a series of observations in this phase which highlight changes that may be classified as a “milestone.” It considers what may be defined as an average child in such analysis. In particular, it focuses on the changes defined under the key features of Physical, Mental and Emotional. It identifies the important feature of “object permanence” related to the development of a child’s intelligence
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