Watts, who has two sons Alexander, five, and Samuel, three, with partner Liev Schreiber, says it becomes a little taxing when the children fight, reported Sun online.
"Two boys can be a lot to handle and sometimes you think it would be easier with two girls playing with their tea-sets and dolls. But Liev loves having two boys," she said.
"I suppose I might consider having another child if someone could guarantee me it would be a girl," she added.