Any tips how to regain my figure and natural beauty after giving birth?

This will be my second child with 2 yrs age gap. I iwll be giving birth on June. My worst problem with my first child were the embarring stretchmarks. I used L'oreal cream, seems didnt work. 2nd is a bulky tummy, third was the figure. Is there anyone can advice me, if theres any supplement tablet like calcium or vit e to take (by the way I am feeding ofr 6 months), or stretchmarks cream are real and what's the best brand i can count on. .. Thanks in advance