Have you seen or know of a small child who covers his or her mouth when yawning?

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I have probably seen this display of manners by children as young as 5 or 6 once or twice in my lifetime (I have heard of a couple of babies as young as a year old that can do it!) but can't exactly recall since it is becoming more rare to see even adults do it these days. So does anyone know or has ever encountered a little child who could put most adults to shame when using basic manners like covering the mouth when yawning?