'Little Women: LA' Star Has Lil' Birth

"Little Women: LA" star Briana Renee overcame a difficult pregnancy and gave birth to a baby boy ... TMZ has learned.

Sources connected to Briana and her husband, Matt Ericson, tell us their kid arrived Wednesday at a San Diego hospital ... tipping the scales at 5 lbs, 3 oz. We're told they're keeping the name under wraps for now.

The birth came 4 and a half weeks early, but we're told everything went smoothly. As we reported ... Briana was briefly hospitalized when she experienced early contractions 6 months into the pregnancy.

This is their first child together. Mazel!