Apr 7, - 8 Ways Sex Can Change After Childbirth, According To Ob/Gyns . cases, get an infection because your cervix is still extra-dilated after giving birth. If you deliver vaginally, you might experience some bleeding the first few. Feb 26, - Bleeding after sex can be a symptom of an underlying health condition. Childbirth can also cause vaginal tissues to stretch and tear, sometimes Any type of infection can cause inflammation of vaginal tissues, making them.