April 06, 2013 02:00 PM

Alberto E. Rodriguez/Getty

Tom Arnold‘s a dad!

The actor and comedian, 54, and his wife Ashley welcomed their first child on Saturday, April 6, his rep tells PEOPLE exclusively.

Son Jax Copeland Arnold arrived at 9:53 a.m., weighing in at 8 lbs., 12 oz. and measuring 21 inches long.

“We are still in a bit of shock,” the proud new parents tell PEOPLE. “It has been a long journey and the healthy birth of our son is a miracle.”

The arrival of their baby boy is the light at the end of a very long tunnel for the couple, who faced infertility problems prior to becoming pregnant.

“I’ve tried with other people, but since there is a God we were unable to conceive. Now God said, ‘This is it!'” Arnold, whose marriage to Groussman marks his fourth, joked while announcing the news in January.

— Anya Leon with reporting by Julie Jordan

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