Please take a seat, Your Rail Highness
workers on London's underground system gave the pregnant Kate Middleton a "Baby on board!" badge – in case she ever needs to ask someone to give up their seat.
That is unlikely to happen, but Kate, who is about five months' pregnant, nevertheless took the badge in good humour, holding it against her coat and joking she would make sure to wear it at home.
She was visiting London's historic Baker Street station for an event marking the 150th anniversary of the city's subway system.
The Duchess of Cambridge was joined by her grandparents-in-law Prince Philip and Queen Elizabeth, who was attending her first public engagement in more than a week following her hospitalisation for a stomach bug.
Howard Collins, who presented the baby badge to Kate, said she asked how it works. The badges are meant to ease the awkwardness often felt by pregnant women when they ask others for a seat.
Kate said on Sunday that she does not yet know the sex of her first child, but hopes it is a boy.