Heather revealed toUs Weekly that her son's name is Tristan Jay El Moussa, and she also shared what inspired the name during a joint interview with Tarek, the 41-year-old former star of Flip or Flop.
"Tarek was supposed to be named Tristan, and his parents ended up naming him Tarek. And then my dad's middle name is Jay. So it's four generations of the middle name Jay," Heather said.
In the photos, Tristan smiled at his parents while wearing a onesie that read, "New to the El Moussa crew." The parents and their new little bundle of joy were matching in blue and white clothing.
Tarek and Heather got engaged in July 2020 and tied the knot in October 2021. They announced they were expecting their first child together in July 2022.
Tristan was apparently born a few days after his due date of January 27.
When the baby's movement had "decreased" over several days, Heather was rushed to the hospital last month to get monitored.
Because the former model "had scar tissue built up" from a past biopsy, which she said made it difficult for her water to break, she was given a pill to soften her cervix and get the process started.
The couple was told to expect "about two to three hours of pushing" but their son arrived quickly.
"I thought we were going to end up doing [an] emergency C-section because his heart rate was dropping. And... the doctor told Heather, 'Give one last big push, give everything you have, let's see if we can make it happen.' And she did,'" Tarek recalled.
"All the blood vessels in her face broke and her chest broke. And our son came out."
Tarek said the birth of his son was a "surreal moment," even though he's already witnessed his first two kids being born.
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"It was like a feeling that I didn't even know [could happen]. And it was just such a beautiful thing," Tarek noted.
The Flipping 101 host has two other children -- daughter Taylor, 12, and son Brayden, 7 -- from his prior marriage to his former Flip or Flop co-star, Christina Hall, who went by Christina El Moussa when she first became famous.
Taylor and Brayden are "so excited" about their little brother, according to the couple.
"They came to the hospital the day after he was born and they both held him," Heather said.
And while Heather is close to Tarek's kids from his past relationship, she said carrying and welcoming her own baby was "such a beautiful thing" for her female body to do.
The spouses gushed about how they're "really excited" to watch Tristan grow and his nursery is very "calming."
But Heather admitted "all the firsts" are "a little nerve-wracking" since her newborn is so "fragile." She called that the "hardest part" of parenthood so far.
Tarek also shared how Christina is "very happy" for the couple and the new addition to their family.
Heather told Us that she's thankful to have such a "good support system," especially considering she had dealt with fertility issues prior to welcoming her first child.
When asked whether they'd like to start trying for Baby No. 2, Heather hesitated and replied, "We'll have to see how things go."
Tarek and Heather reportedly first met in Newport Beach, CA, on the Fourth of July in 2019 through mutual friends, and they moved in together less than one week after their first date.
The couple was photographed together in late July 2019 and then went Instagram official in early August of that year.
Tarek and Christina were married for seven years before quietly breaking up in May 2016. The former couple didn't publicly announced their split until December of that year.
Tarek filed for divorce in January 2017, and the paperwork was finalized one year later.
For Christina's part, the Christina on the Coast and Christina in the Country star got married to her second husband, Ant, in December 2018 and the pair welcomed a son Hudson together. The duo split in September 2020 after nearly two years of marriage, and they finalized their divorce in June 2021.