A JD Wetherspoon spokesman said: "The manager took the decision to put the poster in the pub to emphasise to customers that she would not allow parents to drink while their children were running round uncontrolled in the pub.
"The notice had a positive effect, with mostly good feedback."
According to a 1902 licensing act, it is illegal to be drunk while in charge of a child under the age of seven. Anyone found in contravention of the rules can face a fine – or even a month behind bars