A study was conducted to investigate the claim made by proponents of the natural childbirth method that attendance in the program results in a decrease of the anxiety commonly associated with pregnancy and delivery. Seventy-two pregnant women filled out the A-State and A-Trait forms of the STAI twice in their obstetricians' offices at points which approximated 6.5 and 8.5 months along in their pregnancies. Subjects who elected not to attend natural childbirth classes evidenced significantly higher state and trait scores as compared to those scores of subjects who did attend classes. Implications for dealing with these differences are discussed in terms of the natural childbirth program.