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Kids won’t really become competent swimmers until age 6 or 7, says Terri Lees, who is a Red Cross instructor trainer and sits on the organization’s Scientific Advisory Council.

References

https://www.washingtonpost.com/national/health-science/at-what-age-should-a-child-learn-to-swim-very-early-may-not-be-best-experts-warn/2014/06/30/24490806-f649-11e3-a606-946fd632f9f1_story.html?noredirect=on&utm_term=.8006dc05a248
At what age should a child learn to swim? Very early may not be best, experts warn
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美國小兒科研究院卻建議那些4歲以下兒童的父母，不要再讓他們的孩子過早地開始學習游泳。研究認為，嬰兒天生會游泳其實是一種誤導。由於人體的密度比水稍低，任何人如果不懼怕水，能放鬆自己的肌肉，不會游泳也能在水中浮起來。可人類在後天形成了對水的懼怕心理，一到水裡就驚慌失措，拚命掙扎，容易吞水吐氣，反而容易沉下去。而嬰兒還沒有形成對水的懼怕心理，到了水裡容易放鬆，所以比不會游泳的成人容易浮起來。

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