“含着金汤匙出生”比较接近原意，也符合逻辑。其实英文原话里是银汤匙，而不是金汤匙：born with a silver spoon in one's mouth，富贵人家用银（金）汤匙给出生的婴儿喂食是很有可能的事，而婴儿就会把银（金）汤匙含在嘴里。
“含着金钥匙出生”在英文里没有对应的或接近的说法，而且钥匙一般比汤匙小，婴儿含着钥匙其实容易误吞的，是不太安全的，很少有家长会这么做的。
More common is: "You were born with a silver spoon in your mouth." means you were born very rich. Only rich people can afford real silver (or golden) spoons. 例句：Some girls were born with a silver spoon in their mouth, I was born with a diamond tiara on my head.
使用born with a golden spoon in one's mouth也是可以的，但是born with a silver spoon in one's mouth是英文习惯用语。
Born with a silver spoon
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