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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
Medication errors are three times higher among children and infants than with adults.
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.
Approximately 500,000 babies are born each year in the United States to teenage mothers.
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