M-W has 1948. OED appeals wanted an antedate to 1970. 15 August, 1927 _Stevens Point(WI) Daily Journal, 3/4. <<An excellent precaution to prevent the "dowager's hump" at the back of the neck is to sleep without a pillow, or else use a baby pillow instead of a big one.>> [How's that for medical advice?] Sam Clements