Cavallari, 27, and husband Jay Cutler welcomed their second child, Jaxon Wyatt Cutler in May and she already has her fit, toned physique back, reported E! Online.
"I'm a freak about what I put in my mouth. I'm constantly reading labels and I don't eat any toxic chemicals, so I think that plays a huge role. I'm breast-feeding, which burns a ton of calories, and I can probably just thank my mama too, you know," the mother of two said.
Cavallari also credits her figure to easy pregnancies. "I'm lucky. Both pregnancies have been really easy for me," she said.