Doctor says not to feed my baby as much as I am?

Ignore ALL doctors and well meaning friends. Your baby will eat as much as she needs as often as she needs. My daughter also ate on the same routine your daughter's eating. Please follow your own instincts and know that you are doing JUST FINE with the schedule you are feeding her on. Every 3 hours is a normal schedule. Like you, I had a doctor try and tell me to limit the amount of formula I was giving her and all that did was make for a very unhappy baby. As soon as I resumed feeding on demand she was fine! Doctors sometimes don't know what the hell they are talking about. Follow your own mother's intuition and feed on demand.