Kate Middleton’s secret to staying slim after giving birth twice is constantly chasing after her young children, she told a party guest in India. The Duchess of Cambridge, who is visiting India with her husband Prince William during the couple’s first royal tour in two years, was “gracious” as she fielded questions from a garden party attendee in Delhi on Monday, PEOPLE reports. “We said, ‘How do you lose all the weight after having two kids?’ ” Bulbul Dhar-James, a professor, told the magazine.