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Which child's behavior is not within the normal growth parameters for their age?

  1. A 2-month-old who coos and smiles

  2. A 14-month-old who understands complex commands

  3. A 20-month-old who can walk without support

  4. A 3-year-old who can speak in three- to four-word sentences

The correct answer is: A 14-month-old who understands complex commands

Understanding normal growth parameters for children is essential in recognizing behavioral milestones. The behavior described for the 14-month-old child is notably advanced compared to typical developmental expectations. At this age, children usually begin to understand simple commands but may not fully grasp complex commands. In contrast, the other behaviors mentioned align well with typical developmental benchmarks. For instance, a 2-month-old cooing and smiling demonstrates early social engagement, a 20-month-old walking without support is a common achievement as most children walk by 12 to 15 months, and a 3-year-old speaking in three- to four-word sentences indicates typical language development, as children often reach this level of speech clarity around age 3. This understanding of these developmental milestones helps to identify when a child's behaviors may suggest a delay or require further assessment, which is critical for early intervention and support.