Hollywood actor Matt Damon is holding off on having children until he learns how to discipline them.

Damon, whose fiancee Luciana Barroso has six-year-old daughter ALEXA from a previous relationship, admits that he's far too gentle with youngsters.

He says, "I have longed for (kids) in real life, anyway. I just have to learn how to be a disciplinarian.

"Now I'm good at winding kids up, but I'm not so good at chilling them out."