K.C.
You need to see the pediatrician again. A 6 month old baby will go downhill FAST and your doctor should know that. Make sure the doctor checks her abdomen. Little ones intestines can get twisted and, they need to be corrected quickly. Does she cry in pain? Does she have a fever? Does she have a hard spot somewhere in her abdomen? You are the advocate of your child and sometimes, you have to make a fuss.