Maria Puente

USA TODAY

Eric Trump, the middle son of President Trump, announced Monday that he and wife Lara Trump are expecting their first child, a son, this fall.

"@LaraLeaTrump & I are excited to announce that we are adding a boy to #TeamTrump in September," Trump tweeted. "It's been an amazing year. We are blessed!"

Lara Trump also tweeted about the pregnancy, saying they are "thrilled to finally share the great news!"

The couple granted an interview to People magazine.

“We found out on my birthday, which was pretty cool,” said Eric Trump, 33.

Lara Trump, 33, a former Inside Edition producer, said she’s in her second trimester and is feeling well but, “I was exhausted in the beginning."

Eric Trump is the younger son of the president's three oldest children, with his first wife, Ivana Trump.

His oldest son, Don Jr. and his wife, Vanessa, have five children. His elder daughter, Ivanka Trump and her husband, White House senior aide Jared Kushner, have three children.

The president and Ivanka tweeted their congratulations. "Very proud and happy for the two of you!" POTUS posted.

The president also has two younger children, Tiffany, 23, whose mother is his second wife, Marla Maples, and Barron, who turned 11 on Monday, with his third wife, first lady Melania Trump.

Since President Trump was elected, he has stepped away from his real estate and resort empire, the Trump Organization, and turned it over to Eric Trump and Don Jr. to run. Eric is in charge of the company's 17 golf courses. He's also president of the Trump Winery, in Charlottesville, Va., which the Trump Organization bought in 2011.

Most recently, he and Don Jr. presided over the grand opening of the Trump International Hotel and Tower in Vancouver, B.C., on Feb. 28, which is the Trump Organization's first new international property since Donald Trump assumed the presidency.