But parents should still try to correct bad sleep habits, expert says.
A new study of twins suggests that genes may play a big role in how long babies and toddlers sleep at night, while environment is key during nap time.
Researchers found that among nearly 1,000 twins they followed to age 4, genes seemed to explain much of the difference among youngsters’ nighttime sleep habits. In contrast, napping seemed mainly dependent on the environmental setting — especially for toddlers and preschoolers.
So ...
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