Queen Elizabeth and Prince Philip’s marriage is one of the most enduring marriages in the history of the royal family. The royal couple has managed to keep the flame alive through small gestures of love, the most touching of which Prince Philip made when his wife gave birth to their firstborn, Prince Charles.

On Nov. 14, 1948, then Princess Elizabeth was in Buckingham Palace, preparing to give birth to Prince Charles. Since Prince Philip was not allowed to stay inside the delivery room at the time, he spent his entire time playing squash and going swimming, keeping himself busy to keep all his worries at bay while his wife was in labor.

As soon as Prince Philip got the news that Queen Elizabeth had already given birth to the royal baby via caesarean section, he immediately rushed back into the Buhl Room of the palace to check on his wife and see their newborn. Donning his sporting flannels and open-neck shirt, he carried Prince Charles into his arms and declared in jest that he looked like a plum pudding.

After trying to make Queen Elizabeth smile, he made the sweetest gesture any husband could make for his beloved wife. While Queen Elizabeth was lying down, still tired and fresh from labor, Prince Philip presented her with a bouquet of roses and carnations, signifying his love and appreciation for her.

To celebrate the arrival of the new heir to the throne, the bells at the Westminster Abbey also rang out, and a 41-gun salute was fired by the King’s Troop Royal Artillery. At the Trafalgar Square, all the fountains were lit blue. Outside Buckingham Palace, more than 4,000 people gathered to wait for updates about the new royal baby.

Although Prince Philip was a first-time father when Prince Charles was born, Katharine, Duchess of Kent, revealed that he was so good at being a father to their child. He was reportedly so entranced by the arrival of Prince Charles that his being a hands-on father came out so naturally. “He carries the baby about himself quite professionally, to the nurse’s amusement,” revealed the duchess.

Queen Elizabeth and Prince Philip Queen Elizabeth II, Prince Philip, Duke of Edinburgh, make their way in the royal procession during day 1 of Royal Ascot at Ascot Racecourse. Charlie Crowhurst/Getty Images for Ascot Racecourse