Jana Kramer‘s a mom again!

The couple’s son was born in Los Angeles at 7:53 a.m., weighing 7 lbs., 12 oz., and measuring 20.5 inches.

“Welcome to the world Jace Joseph Caussin. Our hearts are so full. Thank you to all our friends and family and all of you who have supported Mike and I and our growing family,” says Kramer.

Jace joins big sisterJolie Rae, who turns 3 in January.

Courtesy Jana Kramer

Jana Kramer babyCredit: Courtesy Jana Kramer

Jana Kramer with newborn Jace and husband Mike Caussin.Courtesy Jana Kramer

Jana Kramer babyCredit: Courtesy Jana Kramer

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Kramer spoke to PEOPLE exclusivelyabout her pregnancy newsin June, opening up about how the couple —who reconciled afterCaussin’s cheating scandal — endured three miscarriages and two chemical pregnancies before becoming pregnant naturally following a failed IVF cycle and subsequent loss that February.

“It’s hard because it’s like ‘Have hope,’ but when you’re in that moment, hope is the hardest to find,” she said. “It’s so hard not to [stress] when you want a family so bad.”

Even after gettingher pregnancy officially confirmed, “I didn’t want to get excited,” Kramer recalled. “I didn’t want to tell a soul — even our family — because I just don’t want to go through telling people that we lost it.”

RELATED VIDEO: Jana Kramer Expecting Second Child with Husband Mike Caussin After Multiple Miscarriages

After a tough first trimester riddled withrelentless morning sickness, the “Why You Wanna” singer revealed in July on her iHeartRadio podcast,Whine Down with Jana Kramer,that herbundle of joy was a boy.

Jana Kramer/Instagram

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During a recent visit toThe Doctors, the “Dammit” singer explained that both of her children were conceived “right after a failed IVF” cycle. “I don’t know if my system needs[something] like the progesterone? I don’t know,” Kramer said. “I don’t know if my body needed [something] that IVF helped to get me going.”

In the audience sat Dr. Shanin Ghadir, an OB/GYN and reproductive endocrinologist, who confirmed Kramer’s suspicions that there could be a link between an IVF cycle and a natural conception soon after.

“There are some people, who for some reason or another, we are not surewhy IVF is not working,” he said, explaining that it’s important, in his opinion, to be proactive about procedures like genetic screening of embryos and “trial transfers,” where doctors test the uterine lining for sufficiency in supporting an embryo.

“Butthe actual process of IVF whetherit’s the hormones, whether it’s the lighting up of the uterus and the ovaries, it kind of wakes things up and as they are not successful maybe at that moment, during the next couple of months, their body releases that magical egg that allows them to implant,” Ghadir added.

source: people.com