The Heimlich maneuver is generally safe to use on adults and older children. For children, you may have to adjust your position a bit by kneeling or crouching to get on their level. The procedure should not be used on infants or small children, however -- there are different forms of first aid for them. The classic Heimlich maneuver also isn't suitable for pregnant women, but a modified form using chest thrusts can have the same effect. A person can even perform the Heimlich maneuver on herself if she begins choking when alone.
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