Background & Aim: the aim of this study was to investigate the effects of group training classes of birth preparationon the knowledge, attitude and practice of pregnant mothers.

Material & Methods: This experimental study was designed with 85 mothers volunteered to participate in childbirth preparation classes in six groups of 15-14 people. Classes were hold every 2 weeks in Arak Taleghani Hospital. The knowledge and skills of prenatal care, nutrition, exercise, correct feeding, postpartum care and newborn have been taught In these classes. Teaching methods were Lectures, films, and pamphlets. Findings were evaluated by ﭏ² and Wilcoxon test.

Results: The collected data showed that Mother's knowledge in prenatal care increased after training (25.4 ± 2.7 vs. 17.91±5.2) (p=0.001). 63.1% mothers had good attitude about prenatal care that increased to 94.1% after training (p=0.001). 50.5% mothers used safe methods of contraception and 80% had used exclusive breast feeding  up to 5 months.

Conclusion: The use of group education had a significant effect on knowledge, attitude and practice of pregnant women.