By the late 1960s however, Spock's public opposition to the Vietnam War would prove to have a damaging effect on his career. It was reported that the 1968 revision of Baby and Child Care had sold half of what the previous edition sold.[7] Later in life Spock wrote a book entitled "Dr. Spock on Vietnam" and co-wrote an autobiography entitled "Spock on Spock" (with Mary Morgan Spock), in which he stated his attitude toward aging: "Delay and Deny".[citation needed]