This allows urine to be retained in the ureters and bladder. Fifteen percent of pregnant women have bladder infections without even knowing it. If you get a UTI during pregnancy, it's important to treat it right away because kidney infections, dangerous enough to you, can also lead to premature ruptures of the membranes and thus premature delivery of your baby. Your doctor will know which antibiotics are safe to take during pregnancy. This is one of the reasons your doctor will ask for a urine sample during your pregnancy checkups.
Many body fluids can mix outside the body and re-enter it during the intense activity of childbirth.
In addition, the hemorrhoids that frequently disturb women after delivery provide sites for potential infection. As your body ages, your bladder becomes less elastic and may not empty completely. That allows urine to collect, and create a hospitable environment for bacteria, thereby encouraging infection. Older people tend to be less active, which adds to the problem, restricting the movement of bladder muscles and thus impeding emptying. A clean, flushed bladder also requires a nutritious diet, which the elderly don't always maintain.