Calories?

Hi guys! It has been a long time since I have been on here. I had a baby about 18 months ago and started gaining weight shortly after his birth. I am now trying to get back on track. Does anyone know what is the average amount of calories we should be getting everyday? I have heard anywhere from 800-1200. Any ideas? Thank you for any advice!

I read in this page I found that it's 1000-1200.

http://www.digestivewellness.net/pages/pdf_diets/diet_gastric_bypass.pdf