Hollywood actor Robert Downey Jr. and his wife Susan have welcomed their first child together.

The couple, who married in 2005, celebrated the birth of their son Exton Elias early Tuesday morning in Los Angeles. The Oscar nominee also has an 18-year-old son, Indio, with his first wife, actress and musician Deborah Falconer. They were married from 1992 to 2004.

"Everyone is healthy and they couldn't be happier," a friend of the Downey family told People magazine. Baby Exton Elias Downey weighed in at 7lb 5oz and is measured 20 inches long.

The "Sherlock Holmes" star had previously revealed and announced on live television that his wife, 38, was pregnant in August, much to his producer wife's shock.

Downey Jr. was also not able to keep the baby's gender a secret during an appearance on "The Tonight Show" with Jay Leno in December. "I am not permitted to discuss it," the 46-year-old actor told Leno about revealing the child's sex. "I can't say a word. We're having a boy!" Downey exclaimed.

"I could never really stay mad at him, but I can tell you it genuinely wasn't something we planned to reveal," Downey's wife, Susan, said.

However, the actor did manage to keep quiet about their name choices for the baby. "If I told you the name, then she would lop off my head with a machete," Downey joked.

The actor recently admitted that the impending fatherhood was making him consider slowing down though he admitted it was unlikely to happen.

"Life is good. With a new baby on the way, maybe I ought to think about slowing down a little. But I can't see that happening in the short term," Downey shared.

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