Objective: This quasai-experimental research aimed to compare the level of pain in labor phase 1 and 2 of primiparous women who have a caring for natural childbirth with those who have a caring for normal labor.

Materials and methods: The subjects of this research were 80 primiparous women. They were divided into two groups: 40 in an experimental group and 40 in a control group. The experimental group received natural childbirth program in 6 aspects: 1) humanized health care, 2) psychosocial and emotional support, 3) avoiding routine interventions, 4) not disturbing natural process of birth, 5) use of non-pharmacological pain relief methods, and 6) strong promotion of the natural process of birth. The control group received caring for normal labor. A questionnaire about the level of pain during labor was used to collect data. The data were analyzed using descriptive statistics and independent t-test.

Results: The average score of level of labor pain in phase 1, when the cervix opened 4-7 centimeters and 8-10 centimeters and the level of labor pain in phase 2 of the experimental group were significantly less than those of the control group (t=2.38, p<0.05; t=2.90, p<0.01 and t=4.93, p<0.001 respectively).

Conclusion: The caring for natural childbirth was beneficial to primiparous women in terms of the level of labor pain. The natural childbirth is an efficient type of labor and it should be widely promoted.