In 1984, Diana gave birth to Prince Harry. But Charles did not seem too happy about it
She had enormous pressure on her to have a second child, but things did not quite go according to plan for her.
Princess Diana was much beloved during her lifetime by the public, but she wasn't so popular amongst the members of the royal family.
As reported by Meaww, Diana was under a great deal of pressure from the royal family to produce heirs to the British Throne.
As the Princess of Wales, Diana became the People's Princess. She was known for being a loving and charitable princess and mother to her beloved sons, Prince William and Prince Harry.
But while she had produced the heirs she was required to, her husband wasn't too happy with her.
After she had given birth to Prince William in June 1982, Diana was told that she would have to have another child, as there needed to be a spare to the heir.
The pressure on Diana was even greater in her second pregnancy than the first time around. In September 1983, everyone got their wish, as Diana was pregnant again.
Unfortunately, the stress placed on her during that time was so much that she later suffered a miscarriage at Balmoral estate in Scotland just a week later, shortly after the palace publicly announced her pregnancy.
Luckily for Diana, things seemed to settle down in the next year, and she fell pregnant again. This time, she was able to carry the pregnancy through to the end, and the world was introduced to Prince Henry Charles Albert David.
But when Prince Harry was born, Charles was very disappointed. He had made it known that he would have preferred to have a daughter, and was unhappy that his second child was also a boy.
Diana later told Andrew Morton, the author of Diana: Her True Story, that the look on Charles' face after learning his second child was also a son was that of "dismay."
"Harry was a boy. His first comment was, 'Oh god, it's a boy.' His second: 'And he's even got red hair,'" she quoted.
It had been a stressful pregnancy for the princess, and she had suffered through 9 hours of labor without any pain killers, only for her husband to proclaim his disappointment in her.
Diana's two siblings also had red hair, so she took the comment quite personally. Charles even went on to tell her mother at Harry's christening that he was disappointed that she had given birth to another boy.
Princess Diana also later commented that she believed their marriage had been stronger before Harry's birth.
"As Harry was born, it just went bang, our marriage. The whole thing went down the drain," she said.
It was also around this same time that she discovered Charles was having an affair with Camilla Parker-Bowler.