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You could be having urinary bladder prolapse
associated with urinary retention
and infection. Avoid drinking much water at night before sleeping. Get your urine tested for infection. Does the urine flow increase on coughing and straining. Did you deliver the babies normally or by Caesarian section. Your sphincters may be weak because of prolapse for which you need to get thorough checkup by your Doctor and appropriate treatment. You can drink 6-8 glasses of water a day to prevent symptoms of infection. Also get tested to rule out irritable bladder.