[writername]

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It is not until "...entire room to hear" that we are certain they are in a restaurant.

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I'm fairly certain they are in a home setting. I won't ask Solo to confirm this because it is a matter of perception, but the image of the baby playing on the carpet with the toy almost certainly implies they are at home, and the expression "entire room to hear" is just that, an expression, and doesn't have to imply a crowded restaurant.