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The 1950s were wild...
(mander.xyz)
A place for majestic STEMLORD peacocking, as well as memes about the realities of working in a lab.
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That method is still mostly recommended, though mostly for younger children/babies. The Heimlich maneuver is difficult to perform on a small body. You either over squeeze, and cause harm, or are too tentative, and so not helping.
With babies, you hold them lying on your forearm, facing downwards, and slap (open handed) hard. I've only seen it used once, but it worked perfectly then.