R+B star Usher is always worried about the welfare of his seven-month old son - because the tot is so hyperactive.

The Confessions singer welcomed his first child, Usher Raymond V, in November with his wife Tameka Foster.

But Usher and Foster live in constant fear that the youngster will injure himself because he is such an active child.

Foster tells Usweekly.com, "He's like hyper baby - he's crawling so fast. He stands up, and he's walking around the table. It's amazing to watch him. I've never seen a baby crawl so fast! I call him Dash, like on the Incredibles (2004 Pixar movie)."

"We're just scared because the baby knows how to get off the bed already, so our bed is like a gigantic crib because we have rails."

And Foster admits that they are already keen to expand their brood.

She adds, "I'd love to have more, we just gotta make the time."