The Bridget Jones star "recommends" people to expand their families, but jokes he was "surprised" when his ex-girlfriend Tinglan Hong gave birth to Tabitha, who is now six months old.
Speaking on the Ellen DeGeneres Show, he said: "Everyone was right all these years, saying, 'Hugh, why don't you have some children? It changes your life.'
"Now that I have a child, it is life changing. I recommend it. Get some! I can't pretend it wasn't a little bit of a surprise. But it's a very nice surprise. In fact, the baby's name in Chinese, because the mother is Chinese, means Happy Surprise'."
Speaking about his daughter previously, Hugh said he liked her "very much".
He said: "[People] said never let anyone know, but the baby period is not that exciting. But I am excited, actually.
"I thought, well, I'll bluff through - but very little bluffing has been required. I like my daughter very much. Fantastic. Has she changed my life? I'm not sure. Not yet. Not massively, no. But I'm absolutely thrilled to have had her, I really am."