A number of things make children more vulnerable to choking than adults: their small upper airways, their inexperience with chewing, and their tendency to “mouth” objects. Because every child is at risk of choking from food and other objects, every child should be taught the universal choking signal.
To show your child the universal choking sign, place both hands across the front of your throat, crossed at the wrists. This gesture should be taken as a serious sign that your child cannot breathe.
From Good Kids, Bad Habits: The RealAge Guide to Raising Healthy Children by Jennifer Trachtenberg.

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Good Kids, Bad Habits: The RealAge Guide to Raising Healthy Children
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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.