Greetings card firm promises to find all remaining copies of old card attacked for sexualising young teenage girls

The greetings card giant Hallmark has promised to track down all remaining copies of an old birthday card which has been attacked for sexualising 13-year-old girls by equating their breast size with their future boyfriends' generosity.

The card, which surfaced on Twitter yesterday, drew immediate criticism because of its front cover rhyme:

"You're 13 today! If you had a rich boyfriend, he'd give you diamonds and rubies. Well, maybe next year you will – when you've bigger boobies!"

Twitter users took to the social media site to labelled the card "horrifying", the "worst card ever made" and "wrong on so many levels".

But David Dean, the managing director of Hambledon Studios, a subsidiary of Hallmark cards, said the card had been manufactured by a company called Creative Publishing before Hallmark bought it in 1998.

"We are as surprised and horrified as anyone else to have discovered that there are still copies in circulation," he said. "The card has not been produced for 15 years and would never pass our own strict guidelines of taste and appropriateness. We would like to assure all our customers that we will do everything in our power to track down remaining copies."