This skinny mom who caused instagram frenzy gives birth to a baby boy.

30 year old US model, Sarah Stage, who caused quite a storm on social media with her pregnant-yet-toned physique, gave birth to a bouncing baby boy on April 14. He's been named James Hunter.

The model became popular on instagram by regularly posting pics showing off her tiny, barely-there pregnancy belly. In the pic above, she was nearly 9 months. Amazing stuff! Congrats to her.