Author and copyright unknown
Miss Molly had a dolly who was sick, sick, sick.
So she called for the doctor to come quick, quick, quick.
The doctor came with his (her) bag and his (her) hat,
And he (she) knocked on the door with a rat-a-tat-tat.
He (she) looked at the dolly and he/she shook his/her head.
And he (she) said, "Miss Molly, put her straight to bed."
He (she) wrote on the paper for a pill, pill, pill.
"I'll be back in the morning with the bill, bill, bill." (Alternate last line, "I'll be back in the morning if she still feels ill!")