"Both mom and baby are doing great and we are so so happy to welcome little Fordy to the world!!!" Rosenbaum, 37, told Us. "Cutest little baby on the planet!"
Fordham reportedly weighed-in at seven pounds and two ounces and measured 18.5 inches.
Hebert, 29, had a feeling her baby was coming soon, as she had posted a sideways selfie of her big bump this past Friday.
"Sometimes I surprise myself," the pediatric dentist tweeted. "This has to be the last weekend!!?!!? #frontheavy #bbayr."
Rosenbaum also took to Twitter late last week about the status of his wife's pregnancy.
"Soakin' in these last moments with my gorgeous wife & the #Rosenbump," he captioned a photo of Hebert at a hospital check-up on Thursday, September 25.
Earlier this month, the couple apparently took a "Newborn 101" class to learn the basics of first-time parenthood.
Hebert and Rosenbaum had celebrated a small baby shower in New York City in July. The pair first announced Hebert's pregnancy in late March and then disclosed one month later they were having a baby boy.