Is any one concerned about weight gained during pregnancy.

I gained a lot of weight after my first child. My final weight was 170 and lost 30 pounds after birth. I couldn't breast feed because my baby wouldn't latch due to her being away from me for two days before we could meet. And I know that helps with losing weight. Which I plan to die with this child as well. My doctor says to cut down my portions. But I just wanted to know your thoughts.