Ivanka Trump's son Theodore crawls for first time in White House

Jan. 26 (UPI) -- Ivanka Trump's baby boy crawled for the first time Wednesday at the White House.

The 35-year-old businesswoman shared a video of Theodore, her 9-month-old son with husband Jared Kushner, learning to crawl following dad Donald Trump's presidential inauguration.

"There were so many incredible milestones this past weekend -- including one for baby Theodore who crawled for the very first time in the White House!" she captioned the clip.

Trump and Kushner are also parents to 5-year-old daughter Arabella and 3-year-old son Joseph. The mom-of-three said in an interview with People in April that her older children are adjusting nicely to their new sibling.

"My daughter is very independent, plus she's incredibly confident of her place within the home," she told the magazine. "So for her I was not too worried about the transition."

"I was a little more worried about [Joseph], he's very much a mama's boy ... [but] he's loved it," the star said. "He loves giving Theodore his bottle, he loves snuggling with us for books, he's always trying to kiss him."

Trump and her family attended President Trump's inauguration Jan. 20, and made headlines after Barron Trump, the only child of Donald Trump and first lady Melania Trump, played peek-a-boo with Theodore as the president signed his cabinet nominations into law later in the day.

"My youngest brother proves he's a baby whisperer -- while my father signs his first executive orders," she tweeted of the incident. The designer also shared a family portrait with the new president.

"Family photo moments after my father @realDonaldTrump was sworn in as the 45th President of the United States," she wrote.

Trump is the only daughter of Donald Trump and his first wife, Ivana Trump, who also share sons Donald Trump, Jr., and Eric Trump. The president is also dad to daughter Tiffany Trump with second wife Marla Maples and Barron with Melania.