The reason? She was worried that having another child would affect her relationship with her 7-year-old son, Luca.
"The guilt that I felt for bringing her into the world was so big," she said. "It was just he and I for so long that he was like, ‘Why? Why, Mum? Why would you do this? I really just love the way it is.' And it wasn't bratty, it was just so sad."
"I was like, ‘How do I reverse this?! It's too late now.' It's such big feelings. When you're pregnant, everything just feels more magnified."
Thankfully, Luca changed his tune after Banks was born in October 2018.
"He came in after I had her. I was just holding her, and the look on his face was an absolute shock," Hilary recalled. "He just said, ‘That's my sister!' And he had to sneeze, so he ran out of the room and was like, ‘I'll be right back.' He let out this huge sneeze in the hallway and said, ‘I had to sneeze and I knew I couldn't do it in here near her.'"
Seeing how effortlessly Luca took on the role of big brother helped Hilary to realise that everything was “going to be OK."
"It's the best. It's a chemical reaction between siblings sometimes where he knows he has to protect her," she added. "It's really sweet the way he looks out for her. But also, sometimes I'm like, ‘Hey, I did OK with you. I promise I know what I'm doing.'"