The 46-year-old mother of two said she should have opted for more kids, reported People magazine.
"I should have had more kids, started younger," the actress said.
Meanwhile, Watts said her partner Liev Schreiber is a good parent to their children, seven-year-old Sasha and six-year-old Kai.
"Liev has a lot more courage than me. He's always saying, 'Let the kids do it. Take the training wheels off!' My bit of fear balances him, and he balances my fear," she said.