My doctor has just rung to tell me that I have a urine infection and has prescribed antibiotics. I am 32 weeks pregnant and nervous about damaging my baby's immune system in the long term. I realise that of course the doctor knows best but I do kind of believe that antibiotics can have an affect on a developing baby's immune system. Obviously I know that it is very unlikely that he will be drastically damaged but I am worried that it will affect his immune system to some degree.