Fields, 44, gave birth to Quincy Xavier Morgan at 10:30 a.m. in Atlanta, Ga. Quincy, who weighed 8 pounds and 8 ounces, joins older brother Sebastian Alexander, 6.
"We are all doing great. Thank you for your love prayers and support," Fields tweeted Tuesday.
The Living Single alum first announced her pregnancy in July. Fields and Morgan, an actor and producer, married in 2007.