Wrong Tits

A woman and a baby were in the doctor's examining room, waiting for the doctor to come in for the baby's first health examination.
The doctor arrived, examined the baby, checked his weight and, being a little concerned, asked if the baby was breast-fed or bottle fed.
"Breast-fed," the woman responded.
"Well, strip down to your waist," the doctor ordered.
She did.
He pinched her nipples, then pressed, kneaded and rubbed both breasts for a while in a detailed examination. Motioning for the woman to get dressed, he said, "No wonder this baby is underweight. You don't have any milk."
"I know," said the woman. "I'm his Grandma, but I'm glad I came."