Former US President Bill Clinton leaked that he and former US Secretary of State Hillary Clinton will be grandparents by October 1.

During an interview this Sunday with CNN’s Fareed Zakaria, Clinton said that “we’re on watch now,” referring to his daughter Chelsea Clinton who is expecting her first child with her husband Marc Mezvinsky. “I hope by the first of October, I’ll be a grandfather.”

On Sunday,   Chelsea tweeted a photo of herself with her parents at the “Clinton Global Citizen Awards.”

The couple have decided to not find out the baby’s gender.