Born with a silver spoon in your mouth
Very privileged (inherited wealth or high social status).
.g. One of my colleague’s family lives in a mansion, he was given a Mercedes as an 18th birthday present and his own house on his 21st birthday. He was obviously born with a silver spoon in his mouth.
It comes from the time (until the 18th Century) when people carried their own cutlery around with them. A silver spoon showed great wealth