The document discusses human development from a scientific perspective, seeking to understand how and why people change throughout life, including physical, emotional, language, social, perceptual, and personality growth. It notes that infants at this stage of development can understand simple instructions when accompanied by vocal or physical cues, use words or word fragments, and are aware of the social aspects of speech.

3. > The scientific study of human
development seeks to understand and
explain how and why people change
throughout life.
> This includes all aspects of human
growth, including physical, emotional,
language, social, perceptual, and
personality development.

10. Some
Characteristics:
•Uses one or more
words with meaning
(this may be a fragment
of a word)
•Understands simple
instructions, especially if
vocal or physical cues
are given
•Is aware of the social
value of speech