Tips/Advice on losing weight after birth..

No

I'm only 21 and I'm having my 2nd baby. I've gained a lot of weight since I had my 1st , I'm 5'8 and weigh around 195 right now but I know I will gain more since I'm only 21 weeks.

My goal weight is to be 145-150 so what can I do after birth of my lo that will help me lose weight ?