Skinny Mom's 6-Pack Abs Are Back Just Weeks After Giving Birth

— -- The woman whose tiny pregnant belly caused a social media uproar is back, and she's brought her six-pack abs and a bikini.

Just a few weeks after giving birth, Sarah Stage, 30, took a break from posting photos of her newborn to snap a selfie in a white bikini with the hashtags "#postpartum" and "#MomLife."

"As long as the baby is healthy I don’t think anything else matters," State told "Good Morning America" in March. "That should be the most important thing."

Stage's photos of her barely-there belly caused a social media debate over whether the model looked fit or famished. Despite being in her third trimester, Stage had defined abs.

She gave birth on April 14 to James Hunter, Stage's representative confirmed to ABC News at the time. He was 8 pounds, 6 ounces and 22 inches long at birth.

Four days later, Stage was back on Instagram, posting a photo of her slim figure. She wrote that she'd gained 28 pounds in all.

Dr. Jennifer Ashton, ABC News medical contributor and a practicing obstetrician and gynecologist, said at the time that she predicted Stage’s body would snap back into shape very quickly after seeing her barely-there belly photos.

"She was in excellent shape to start," Ashton said in April. “She exercised before her pregnancy and all throughout her pregnancy and she ate well."

At 8 pounds, 7 ounces, Stage’s son, James Hunter, was no lightweight. But Ashton said because Stage had gained the appropriate amount of weight, she could see her belly would flatten out quickly. It also helped that she is still young and this is her first baby, Ashton added.