She is showing you her flat tummy just days after giving birth

  O boy but is it good to be doing this on social media..hehehe... Sarah Stage, the skinny mum who caused an uproar online with her barely-there baby bump.na wa oooo

Four days after welcoming a healthy baby boy (she was 9months pregnant in the left pic), she shared the photo on the right and wrote "4 days post baby. Total pregnancy weight gain was 28 pounds. I'm excited to resume my workouts in 5 weeks!" Wow!okooo