Gail and Janelle are talking about the differences between their children. Janelle's youngest, who is one year old, has not yet crawled. Gail says that Janelle should be worried. Should Janelle be worried about her son's motor development?
A. yes-normal children crawl by 10 months according to norms of development
B. no-norms for development refer to an average age and not absolute age
C. no-motor development at this age is controlled by experience, and so Janelle should just spend more time playing with her son
D. yes-10 months is late for crawling
Answer: B
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