Sarah Jessica Parker experienced "absolute euphoria" when she gave birth to her son.
The 51-year-old actress wishes she could go back to when her son James, now 14, was born, because it was the "greatest" feeling and she'd love to experience it again.
Sarah - who also has seven-year-old twins daughters, Tabitha and Loretta, who were born to her and husband Matthew Broderick via a surrogate - said: "If I could revisit one moment of my life, it would be the birth of my children, definitely. I only got to give birth once. James is like, why do you always want to talk about that?! I'm like, because it's the greatest!
"There is this suspended animation around [birth]: everything goes away; the entire world is sucked up; time suspends. It's just you and, in my case, my husband, and this child, and it's absolute euphoria."
Despite her and her husband's wealth, the 'Divorce' star admitted she rarely buys new clothes for her son after watching documentary 'The True Cost', which examined the impact of fashion on people and the planet.
Speaking to Net-a-Porter's The Edit magazine, she said: "I will only buy second-hand clothes for my son.
"The documentary 'The True Cost' really changed me.
"The one area I've had a hard time with is pants, but I buy used T-shirts and sweaters for him. Track pants are hard - boys rip them; I don't know how to get around that."
The former 'Sex and the City' actress regrets not keeping a more visual record of her past, but worried about being intrusive when she wanted to take photos of certain events.
She said: "I wish I had known to take more pictures.
"I should have photographed every fitting of 'Sex and the City'; every shoe I ever tried on anywhere in the world, ever!
"I should have shot those experiences, but I didn't want to intrude on it or ask, 'Do you mind if I take your picture?' Or, 'Do you mind if I document this?' Oh, I should have taken more pictures."