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However, you can know the stages of the birth process and what to generally expect. Childbirth usually occurs in three stages: First stage: The time of the onset of true labor until the cervix is completely dilated to 10 cm. Second stage: The period after the cervix is dilated to 10 cm until the baby is delivered.
Stages of Labor. The first stage of labor is the preparation for birth, During this stage, which takes from three hours in a cow to 72 hours in a first-calf heifer, the ligaments of the pelvis and associated structures relax. The cervix, vagina and vulva all dilate and the cervical mucous plug is released.