President Donald Trump's ninth grandchild is on the way. 

His son Eric Trump confirmed today the news that his wife, Lara, is pregnant.

The baby boy is expected to arrive in September and will be the couple's first child. 

Trump's older son, Donald Jr., and his wife, Vanessa, have five children, while Trump's daughter, Ivanka, and husband, Jared Kushner, have three kids.

The couple, both 33, told People that Lara is in the second trimester and that they learned of the pregnancy on his birthday, Jan. 6. 

"I was exhausted in the beginning. ... It really affected me. But I’m feeling really good now," she said.

The president tweeted his well wishes Monday afternoon:

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Eric Trump sat down for an interview with Maria Bartiromo on "Sunday Morning Futures."

Watch the discussion below.