Confusing Fact with Inference!

A woman and a baby were in the doctor's examining room, waiting for the doctor to come in. The doctor arrived, examined the baby, checked his weight and asked if the baby was breast fed or bottle fed.

"Breast fed" she replied.

"Okay. I want you to strip down to your waist," the doctor ordered. She did as asked. He pressed, kneaded and pinched both breasts for quite a while in a detailed examination. Motioning to her to get dressed he said, "No wonder this baby is hungry. You don't have any milk."

"I know," she said, "I'm his Grandma, but I'm glad I came."