Prince Harry was “high on laughing gas” at the birth of his son Prince Archie. The 38-year-old royal tied the knot with Meghan, Duchess of Sussex in 2018 and the pair went on to have their firstborn a year later but he has now revealed that while his wife was “calm” during the birth, he had to eat chicken from Nando’s. Writing in his new memoir ‘Spare’, he said: “Meg was so calm. I was calm too. But I saw two ways of enhancing my calm. One: Nando’s chicken (brought by our bodyguards). Two: A canister of laughing gas beside Meg’s bed. I took several slow, penetrating hits. Meg, bouncing on a gi…