Weight Issues!!!

Okay here goes. I am having some serious issues. I have gained weight and I am having a hard time getting it off. I know I am older and it is harder but gee whiz!!! I have got to get it off. I used to be so tiny and then gained weight and I have been yo-yo dieting since. Any suggestions from all you skinny girls who have had babies too? I will take any advice I can get.
Thanks!