The actress, 28, welcomed her second child, a baby girl named Beatrix, on Tuesday with her boyfriend Morty Coyle.
"Jodie was amazing and is doing great," Coyle tells PEOPLE. "We are now the proud, excited parents of Miss Beatrix Carlin Sweetin Coyle."
Beatrix, whom her dad is already calling "Bea," is the couple's first child together. Sweetin also has a 2-year-old daughter, Zoie, with ex-husband Cody Herpin.
Beatrix made her debut at 7 lbs., 4 oz. and 19 inches long.
"We're already madly in love with Beatrix and are so grateful for the support from our family and friends. And we can't wait for her big sister Zoie to meet her," the couple tell PEOPLE.
The actress announced her pregnancy in April, and spent her last few days as a mom-of-one enjoying the calm before the storm.
Shortly before giving birth, she joined her former Full House costar John Stamos at his star-studded birthday bash on Aug. 19 – the same day she Tweeted that Zoie "will be a fabulous big sister."