Every year, the premature baby unit at Edith Cavell hospital sends cards to the other departments as well as to ex-patients. This year, they sent this card in mid-October. When you open it you see the message:
It’s a little premature, but Happy Christmas.
If I were them, I’d probably use the word “early” instead of premature. Premature has just too many un-Christmas like connotations (what were you thinking?).