London: Singer Beyonce Knowles, who married long standing boyfriend, rapper Jay-Z in April this year, wants to delay her plans to have children since she has realised how hard it is to be a mother from her sister Solange.

Contactmusic.com reports that winning an Oscar, getting married and having children were three things she wanted to do before she became 30. But Beyonce, 27, is now not sure about having kids in the next three years.

She said: "I'd still love to win an Oscar (but) the kids, I dunno. I've been keeping my nephew and he's the smartest little boy, but he's making it hard. It's a lot of work."