During childbirth, the walls of the vagina are stretched as the baby passes along the cervix and exits through the birth canal. If the baby is having trouble passing through the birth canal, the skin between the vagina and the anus (perineum) may be torn or cut by a doctor or midwife.
Understandably, this whole process causes the vagina to change and it can feel wide, dry and sore for some time. Frequent urination is also common, as well as vaginal dryness, which is associated with lower levels of estrogen in the body. The vagina does not completely return to its original form, but the pain and swelling does usually go away after 6-12 weeks and the dryness usually disappears when the new mother has her period.
Experts recommend Kegel exercises to help strengthen the walls of the pelvic floor and increase the tone of the muscles of the vagina. These are slow compressions and relaxation of the internal muscles of the vagina and anus, and can be performed either sitting or standing. This training will help to quickly strengthen your internal muscles and get rid of the problem of frequent urination.