| | Family Health | Health Pregnancy Why does the uterus open during pregnancy? The uterus does not open during pregnancy. The opening of the uterus (called cervical dilation) occurs during labor and allows the baby to be born. Health Pregnancy - Related Articles Exercises for Increasing Calf Muscle Size How do inhalers improve the health of asthma sufferers? How to cope with type I Bipolar Disorder Non-Sodium Foods Help for Cystitis How to Lengthen a Valve Holder Fitting How is the bone affected by skin cancer?